UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549


                                    FORM 11-K


                 Annual Report Pursuant to Section 15(d) of the
                         Securities Exchange Act of 1934



(Mark One)

[X]        Annual report pursuant to Section 15(d) of the Securities Exchange
           Act of 1934

                   For the fiscal year ended December 31, 2002


                                       Or


[  ]       Transition report pursuant to Section 15(d) of the Securities
           Exchange Act of 1934
           For the transition period from              to
                                          ------------    --------------

           Commission file number   1-8483


A. Full title of the plan and the address of the plan, if different from that of
the issuer named below:


                               UNOCAL SAVINGS PLAN



B. Name of issuer of the securities held pursuant to the Plan and the address of
its principal executive office:

                               Unocal Corporation,
           2141 Rosecrans Avenue, Suite 4000, El Segundo, California 90245







            INDEX TO FINANCIAL STATEMENTS OF THE UNOCAL SAVINGS PLAN




The following financial statements reflect the status of the Unocal Savings Plan
as of December 31, 2002 and 2001, and the results of its transactions for each
of the years then ended.



                                                                    Page Number



Report of Independent Auditors                                              1

Financial Statements:

     Statements of Net Assets Available for Benefits
        at December 31, 2002 and 2001                                       2

     Statements of Changes in Net Assets Available for Benefits
        for the years ended December 31, 2002 and 2001                      3

     Notes to Financial Statements                                         4-8

Supplemental Schedules*:

     Schedule of Assets Held for Investment Purposes
        at December 31, 2002                                                9

     Schedule of Reportable Transactions for
        the year ended December 31, 2002                                   10

Signature                                                                  11

Exhibit Index                                                              12

* Supplemental schedules required by the Employee Retirement Income Security Act
of 1974 that are omitted are not applicable to the Unocal Savings Plan.



                         REPORT OF INDEPENDENT AUDITORS




To the Unocal Savings Plan Committee:


         In our opinion, the accompanying statements of net assets available for
benefits and the related statements of changes in net assets available for
benefits present fairly, in all material respects, the net assets available for
benefits of the Unocal Savings Plan (the "Plan") at December 31, 2002 and 2001,
and the changes in net assets available for benefits for the years then ended in
conformity with accounting principles generally accepted in the United States of
America. These financial statements are the responsibility of the Plan's
management; our responsibility is to express an opinion on these financial
statements based on our audits. We conducted our audits of these statements in
accordance with auditing standards generally accepted in the United States of
America, which require that we plan and perform the audits to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.



        Our audits were conducted for the purpose of forming an opinion on the
basic financial statements taken as a whole. The supplemental schedules of
assets held for investment purposes at December 31, 2002 and reportable
transactions for the year ended December 31, 2002 are presented for the purpose
of additional analysis and are not a required part of the basic financial
statements but are supplementary information required by the Department of
Labor's Rules and Regulations for Reporting and Disclosure under the Employee
Retirement Income Security Act of 1974. These supplemental schedules are the
responsibility of the Plan's management. The supplemental schedules have been
subjected to the auditing procedures applied in the audits of the basic
financial statements and, in our opinion, are fairly stated in all material
respects in relation to the basic financial statements taken as a whole.



/s/PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP
Los Angeles, California
June 6, 2003

                                      -1-



                               Unocal Savings Plan
                 Statements of Net Assets Available for Benefits

                                                         December 31,
                                                  2002                   2001
--------------------------------------------------------------------------------

Assets:
     Investments at fair value              $408,460,282           $485,383,654
     Cash                                        504,396                773,306
                                       ------------------     ------------------
              Total assets                   408,964,678            486,156,960

                                       ------------------     ------------------
Net assets available for benefits           $408,964,678           $486,156,960
                                       ==================     ==================


                See accompanying notes to financial statements.

                                      -2-



                              Unocal Savings Plan
           Statements of Changes in Net Assets Available for Benefits

                                                     Year Ended December 31,
                                                        2002               2001
--------------------------------------------------------------------------------

Additions:
  Additions to (deductions from) net assets attributed to:
    Investment income:
      Net depreciation in
        fair value of investments                $ (76,270,236)   $ (60,087,690)
      Interest                                       1,129,642        2,123,253
      Dividends                                      6,246,389        7,656,962
                                                 --------------   --------------
        Total investment gain (loss)               (68,894,205)     (50,307,475)

  Contributions:
      Participant                                   21,914,732       18,047,217
      Company                                       12,243,216       10,996,479
                                                 --------------   --------------
        Total contributions                         34,157,948       29,043,696

                                                 --------------   --------------
              Total additions (deductions)         (34,736,257)     (21,263,779)
                                                 --------------   --------------

Deductions:
  Deductions from net assets attributed to:
      Participant withdrawals & distributions       42,448,925       53,385,593
      Trustee fees and other expense                     7,100            7,050
                                                 --------------   --------------
              Total deductions                      42,456,025       53,392,643
                                                 --------------   --------------

              Net decrease                         (77,192,282)     (74,656,422)

Net assets available for benefits:
      Beginning of year                            486,156,960      560,813,382
                                                 --------------   --------------
      End of year                                 $408,964,678     $486,156,960
                                                 ==============   ==============

         See accompanying notes to financial statements.

                                      -3-


                               UNOCAL SAVINGS PLAN
                          NOTES TO FINANCIAL STATEMENTS


NOTE 1  - Description of the Plan

General

         Unocal Corporation ("Unocal") was incorporated in Delaware on March 18,
1983, as the parent of Union Oil Company of California. The Unocal Savings Plan
(the "Plan") provides for Union Oil Company of California (the "Company")
matching contributions and for participants' voluntary pre-tax and/or after-tax
contributions. Putnam Fiduciary Trust Company is the trustee ("Trustee") of the
Plan and invests funds contributed by the Company and participants to the Plan.
During 2002 and 2001, all Company contributions were initially invested in
common stock of Unocal and participant contributions were invested at the
discretion of the participants in a range of investment fund options and Unocal
common stock. During 2002 and 2001, participants were permitted to immediately
transfer Company contributions from Unocal common stock into any of the Plan
investment options. Most balances remain with the Trustee until withdrawn by
participants following termination of employment; however loans, hardship
withdrawals, and certain other withdrawals are permitted during employment. The
Plan is subject to certain provisions of the Employee Retirement Income Security
Act of 1974 ("ERISA") as a defined contribution plan.

         The Savings Plan booklet dated May 1, 2000 and the Addendum dated
January 1, 2001 constitute part of a prospectus covering securities that has
been registered under the Securities Act of 1933. The Savings Plan booklet and
Addendum constitute the Summary Plan Description of the Plan as of January 1,
2001. The Company has made certain plan changes that were allowed under the
Economic Growth and Tax Relief Reconciliation Act of 2001. Most of these changes
became effective January 1, 2002 and other changes were implemented by year-end
2002.

Participation

         Regular, full-time employees are eligible to participate in the Plan
immediately upon employment by the Company. Part-time and temporary employees
are eligible to participate following the first service year in which they
complete at least 1,000 hours of service.

Contributions

         Participant Contributions -- Participant contributions are voluntary
and can be all pre-tax, all after-tax, or a combination of both. A participant's
total annual pre-tax contribution limit was raised to 50 percent from 15 percent
of the participant's annual base pay. The pre-tax contributions are also known
as "401(k) contributions". A participant's contributions shall not exceed the
maximum amount allowed by law. A participant's after-tax contribution limit is
15 percent of base pay. The total pre-tax contributions and after-tax
contributions can not exceed 50 percent of base pay.

         Company Matching Contributions -- The Company matches employee pre-tax
401(k) contributions on a dollar for dollar basis, up to six percent of the
contributing participant's base pay.

         At its discretion, the Company directs the Trustee to purchase shares
attributable to Company matching contributions either on the open market or by
private purchases directly from the Company.

                                      -4-



Participant Accounts

         Each participant's account is credited with the contributions and the
respective net investment earnings or losses of the individual funds as governed
by the participant's investment selection.

Vesting

         Participants are always 100 percent vested in participant contributions
and the dividends on those contributions. Vesting in the Company contributions
portion of participants' accounts and the dividends thereon is based on years of
vesting service. Participants are 100 percent vested in Company contributions
and dividends thereon after two years of vesting service. Special vesting rules
also apply to certain participants depending on the date of and reason for
termination of employment.

Payment of Benefits

         Following termination of employment, participants may elect to receive
their account balance or defer their distribution until a later date chosen by
the participant, but not beyond April 1 of the year following attainment of age
70-1/2.

         Following termination of employment and after age 55, participants may
receive partial withdrawals but no more frequently than once per calendar month.

Rollovers into the Plan

         The Plan will accept rollovers from other employers' qualified plans,
subject to certain restrictions.

Loans

         All employees who are participants of the Plan and have a sufficient
balance in their employee pre-tax contributions account are eligible to apply
for a loan. Members borrow against their own pre-tax account balance and all
payments of principal and interest are credited back to their account. Loan
types available are "any reason" (except investment in registered securities);
"home purchase" (for purchase of a primary residence only); and loans "forced"
by a hardship withdrawal request. Repayment periods range from 1 to 15 years
depending on the type of loan. The Unocal Savings Plan Loan and Hardship
Withdrawal Committee determines the interest rate for loans based on appropriate
market rates and applicable federal regulations.

Federal Income Tax Status

         The Company obtained its latest determination letter on October 2,
2002, from the Internal Revenue Service, in which the Internal Revenue Service
stated that the Plan, as then designed, was in compliance with the applicable
requirements of the Internal Revenue Code (the "Code"). The Plan has been
amended since receiving the determination letter. However, the plan
administrator and the Plan's tax counsel believe that the Plan is currently
designed and being operated in compliance with the applicable requirements of
the Code. Therefore, no provision for income taxes has been included in the
Plan's financial statements.

         For 2002, the maximum employee pay eligible for benefit purposes under
a qualified plan was increased to $200,000 per year from $170,000 per year in
2001. If an employee's pay exceeded $200,000, only the first $200,000 of base
pay was eligible for calculating employee and Company contributions.

         Federal regulations place an annual dollar limit on the amount of
employee pre-tax contributions. The limit was $11,000 for 2002 and 10,500 for
2001. Effective September 1, 2002, "catch-up"

                                      -5-


contributions were added to the Plan that allowed employees who were at least
age 50 to contribute an additional pre-tax contribution of $1,000. These limits
are subject to adjustment in future years, in accordance with Federal
regulations. If pre-tax contributions reach the annual limit before year-end,
they are suspended for the balance of the year. The Company matching
contributions are also suspended if the annual limit is reached before year-end.

         Withdrawals from the Plan are generally subject to federal income tax.
Also, in-service withdrawals and withdrawals following termination of employment
prior to retirement may be subject to a 10 percent federal income tax penalty.
Retiring employees and former employees who are at least age 55 may make a
withdrawal from their plan account without a tax penalty.

Plan Amendment or Termination

         The Company expects to continue the Plan indefinitely, but, as future
conditions cannot be foreseen, the Company may at any time or from time to time
amend or terminate the Plan in whole or part. In the event of termination,
participants become fully vested in their individual accounts, and the net
assets of the Plan must be allocated among the participants and beneficiaries of
the Plan in the order provided by ERISA. The Company has no present intent to
discontinue the Company matching contributions or to terminate the Plan.

NOTE 2 - Summary of Significant Accounting Policies

Basis of Accounting

         The accompanying financial statements are prepared on the accrual basis
of accounting in conformity with accounting principles generally accepted in the
United States of America. In addition, the following accounting policies are
applied:

         a. Purchases and sales of Unocal common stock:

         During normal trading by participants, the Trustee will collect all
         participant directed stock trades throughout the day and will execute
         and complete one or more buy and sell trades per day.

         During abnormal conditions or heavy trading by participants, the
         Trustee may not be able to execute and complete participant directed
         trades on the same day without affecting the share price. The Trustee
         is authorized, at its discretion, to buy or sell a portion of the
         trades during the next day or days. Prices received from each day's
         trading will be averaged to ensure that all participants requesting
         trades will be treated equitably.

         b. Dividend income is recorded on the ex-dividend date.

         c. Interest income is recorded as earned on the accrual basis.

         d. Benefits are recorded when paid.

         The Plan presents in the statement of changes in net assets available
for benefits the net appreciation (depreciation) in the fair value of its
investments which consists of the realized gains or losses and the unrealized
appreciation (depreciation) on those investments.

Valuation of Investments

         The Plan's investments are stated at fair value. Shares of registered
investment companies are valued at the net asset value of shares held by the
Plan at year-end. The Unocal common stock is valued at the closing price as
reported for the New York Stock Exchange Composite Transactions at December 31,
2002 and 2001. Investments in common trust funds are valued based on information
provided by the Plan's investment custodian. The financial statements of the
common trust funds are audited annually by

                                      -6-


independent auditors. The value of the assets of the Plan are subject to the
variations in the market. The fair value of the investments and net assets
available for benefits could be materially affected by a change in market
conditions.

Use of Estimates in Preparation of the Financial Statements

         The preparation of financial statements in conformity with accounting
principles generally accepted in the United States of America requires the
Plan's management to make estimates and assumptions that affect the reported
amounts of assets and liabilities and disclosure of contingent assets and
liabilities at the dates of the financial statements and the reported amounts of
additions to and deductions from net assets during the reporting periods. Actual
results could differ from those estimates.

NOTE 3  - Investments

         The following table presents investments that represent 5 percent or
more of the Plan's net assets available for benefits:

                                                      December 31,
Shares in (000s)                                2002               2001
-------------------------------------------------------------------------------

Unocal Common Stock (a)
5,530 and 5,937 shares, respectively           $169,112,172       $214,155,029

Putnam S&P 500 Index Fund
3,027 and 3,014 shares, respectively             65,505,796         83,931,101

Putnam Money Market Fund
46,059 and 40,051 shares, respectively           46,058,612         40,050,878

George Putnam Fund of Boston
2,314 and 2,270 shares, respectively             34,319,318         38,062,917

Putnam New Opportunities Fund
954 and 1,042 shares, respectively               27,840,218         43,736,755

Putnam Voyager Fund
1,460 and 1,527 shares, respectively             19,049,466         27,127,733

(a)  Includes both participant and nonparticipant-directed amounts.

The Plan's investments depreciated in value as follows:

                                                  December 31,
                                        2002                     2001
                                ---------------------------------------------
Mutual funds                            $ (30,936,563)          $(33,821,337)
Common or collective trusts               (18,732,054)           (11,661,112)
Common stock                              (26,601,619)           (14,605,241)
                                ----------------------     ------------------
                                        $ (76,270,236)          $(60,087,690)
                                ======================     ==================

                                      -7-



Nonparticipant-Directed Investments

         The nonparticipant-directed investments and the significant components
of the changes in those net assets are as follows:


                                                     December 31,
                                          2002                       2001
-------------------------------------------------------------------------------

Assets:
     Unocal common stock               $ 72,279,976               $ 87,173,063
                              ----------------------     ----------------------
     Total assets                        72,279,976                 87,173,063

                              ----------------------     ----------------------
Total nonparticipant-directed
         net assets                    $ 72,279,976               $ 87,173,063

                              ======================     ======================

                                               Year Ended December 31,
                                          2002                       2001
-------------------------------------------------------------------------------

Changes in net assets:
     Contributions                      $ 12,243,216               $ 10,996,479
     Dividends                             1,801,096                  1,918,956
     Net depreciation                    (11,204,331)                (5,485,521)
     Benefits paid to participants        (5,036,405)                (6,715,085)
     Transfers to participant -
        directed investments             (12,696,663)                (5,911,656)
                               ----------------------     ----------------------
          Net decrease                 $ (14,893,087)              $ (5,196,827)
                               ======================     ======================

NOTE 4  - Forfeitures by Members

         Company contributions and earnings thereon under the Plan are forfeited
by employees whose employment is terminated before vesting is attained. However,
if an employee is re-employed by the Company and performs an hour of service
within five years after the date of termination of employment, the forfeited
shares will be restored to the employee's Plan account. Amounts forfeited will
be used to restore previously forfeited accounts when necessary. Remaining
amounts forfeited will then be used to offset future Company contributions to
participant accounts.

         At December 31, 2002 and 2001, forfeited nonvested accounts totaled
$87,585 and $45,086, respectively.

NOTE 5  - Parties-in-interest

         Certain of the Plan's investments are shares of mutual funds managed by
the Trustee, as defined by the Plan Agreement. Therefore, these transactions
qualify as party-in-interest transactions for which a statutory exemption
exists. Fees paid by the Plan for investment management services are included in
the net asset value of the shares of the mutual funds; other fees paid by the
Plan are disclosed on the face of the statement of changes in net assets
available for benefits for the years ended December 31, 2002 and 2001.

         The Company, who also qualifies as a party-in-interest, absorbs certain
administrative expenses of the Plan. Such transactions with the Company qualify
for a statutory exemption. Total expenses paid by the Company were $51,082 and
$83,335 for the years ended December 31, 2002 and 2001, respectively.

                                      -8-





                               Unocal Savings Plan
               Schedule of Assets Held for Investment Purposes***
                              At December 31, 2002

       (a)                     (b)                                    (c)                                (d)                (e)
                   Identity of Issuer,                     Description of Investment,
                   Borrower, Lessor                     Including Maturity Date, Rate of
                   or Similar Party               Interest, Collateral, Par, or Maturity Value           Cost          Current Value
------------------------------------------------------------------------------------------------------------------------------------

                                                                                                                
        *          Unocal Corporation          Unocal Corporation Common Stock                     $ 160,970,155      $ 169,112,172
                                               5,530,156 shares
        **         Putnam Investments          Putnam S&P 500 Index Fund                                                 65,505,796
                                               3,027,070 shares
        **         Putnam Investments          George Putnam Fund of Boston                                              34,319,318
                                               2,314,182 shares
        **         Putnam Investments          The Putnam Bond Index Fund                                                12,683,087
                                               971,884 shares
        **         Vanguard Group              The Vanguard Windsor II Fund                                              11,892,613
                                               571,760 shares
        **         Putnam Investments          Putnam International Growth Fund                                           9,709,338
                                               587,732 shares
        **         Putnam Investments          Putnam Money Market Fund                                                  46,058,612
                                               46,058,612 shares
        **         Putnam Investments          Putnam New Opportunities Mutual Fund                                      27,840,218
                                               954,086 shares
        **         Putnam Investments          Putnam Voyager Fund                                                       19,049,466
                                               1,459,729 shares
        **         Putnam Investments          Vanguard Life Strategy Income Fund                                         1,578,474
                                               128,123 shares
        **         Putnam Investments          Vanguard Life Strategy Moderate Growth Fund                                  918,720
                                               66,238 shares
        **         Putnam Investments          Wells Fargo Small Cap Opportunities Fund                                     745,823
                                               32,812 shares
        **         Putnam Investments          PIMCO Renaissance Institutional Fund                                         577,998
                                               39,346 shares
        **         Putnam Investments          Royce Opportunity Fund                                                       745,622
                                               101,033 shares
        **         Putnam Investments          Vanguard Life Strategy Growth Fund                                           489,449
                                               34,084 shares
        **         Putnam Investments          Vanguard Life Strategy Conservative Growth Fund                              141,141
                                               11,009 shares
        **         Putnam Investments          Participant Loans (General loan term varies up to 5 years;                 7,092,435
                                                 primary residence loan varies up to 15 years;
                                                 interest rate 5.5% to 8.75%)
                                                                                                                 -------------------
                                               Total assets held for investment purposes                              $ 408,460,282
                                                                                                                 ===================

*   Sponsor and employer and, therefore, a party-in-interest for which a statutory exemption exists.
**  Trustee for the Plan and, therefore, a party-in-interest for which a statutory exemption exists.
      The Vanguard Windsor II Fund is also available through Putnam Investments.
*** Under ERISA, an asset held for investment purposes is any asset held by the Plan on the last day of the Plan's
      fiscal year or acquired at any time during the Plan's fiscal year and disposed of at any time before the last day
      of the Plan's fiscal year, with certain exceptions.


                                      -9-




                                                      UNOCAL SAVINGS PLAN
                                            Schedule of Reportable Transactions (1)
                                                       December 31, 2002

 (a)                     (b)                    (c)           (d)       (e)     (f)          (g)            (h)               (i)
Identity of      Description of Assets                                         Expense                 Current Value of
  Party         (including Interest Rate     Purchase      Selling    Lease Incurred With   Cost        Asset on
 Involved    And Maturity in Case of a loan)   Price        Price     Rental Transaction  of Asset    Transaction Date    Net Gain
------------------------------------------------------------------------------------------------------------------------------------

                                                                                                         
Unocal
Corrporation (2) Common Stock               $45,700,760                                  $ 45,700,760   $ 45,700,760
                      (397 transactions)

Unocal
Corporation  (2) Common Stock                            $ 59,311,213                      51,429,059                   $ 7,882,154
                      (696 transactions)

Putnam Money
Market Fund  (3) Fund Shares                $48,573,092                                  $ 48,573,092   $ 48,573,092
                      (611 transactions)

Putnam Money
Market Fund  (3) Fund Shares                             $ 42,565,358                    $ 42,565,358                   $     -
                      (460 transactions)


(1)  Under ERISA, a reportable transaction is defined as a transaction or series of transactions
     during the Plan year that involves more than 5 percent of the fair value of the Plan's net assets
     at the beginning of the Plan year, with certain exceptions.

(2)  Sponsor and employer and, therefore, a party-in-interest for which a
     statutory exemption exists.

(3)  Trustee for the Plan and, therefore, a party-in-interest for which a
     statutory exemption exists.


                                      -10-





                                    SIGNATURE


Pursuant to the requirements of the Securities Exchange Act of 1934, the
Committee appointed by the Board of Directors of the Company to administer the
Plan has duly caused this annual report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                            UNOCAL SAVINGS PLAN



Date:  June 27, 2003                    By:  /s/Joe D. Cecil
                                            --------------------------------
                                            Joe D. Cecil
                                            Unocal Savings Plan Committee Member

                                      -11-




                                  EXHIBIT INDEX



 Exhibit 23      Consent of PricewaterhouseCoopers LLP

 Exhibit 99      Certification Pursuant to 18 U.S.C. Section 1350


                                      -12-