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


                                    FORM 10-Q


                Quarterly Report Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934

                  For the quarterly period ended June 30, 2001


                         Commission File No. 33-26097-05


                           PARKER & PARSLEY 90-A, L.P.
                          -----------------------------
             (Exact name of Registrant as specified in its charter)


                         Delaware                              75-2329245
          -----------------------------------------      ---------------------
              (State or other jurisdiction of               (I.R.S. Employer
              incorporation or organization)             Identification Number)


     5205 N. O'Connor Blvd., Suite 1400, Irving, Texas           75039
     -------------------------------------------------        ------------
         (Address of principal executive offices)              (Zip code)

       Registrant's Telephone Number, including area code : (972) 444-9001


                                 Not applicable
              (Former name, former address and former fiscal year,
                         if changed since last report)

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  Registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.

                                Yes / x / No / /









                           PARKER & PARSLEY 90-A, L.P.

                                TABLE OF CONTENTS

                                                                       Page
                          Part I. Financial Information

Item 1.    Financial Statements

           Balance Sheets as of June 30, 2001 and
              December 31, 2000.....................................    3

           Statements of Operations for the three and six
             months ended June 30, 2001 and 2000....................    4

           Statement of Partners' Capital for the six months
             ended June 30, 2001....................................    5

           Statements of Cash Flows for the six months ended
             June 30, 2001 and 2000.................................    6

           Notes to Financial Statements............................    7

Item 2.    Management's Discussion and Analysis of Financial
             Condition and Results of Operations....................    7


                           Part II. Other Information

Item 6.    Exhibits and Reports on Form 8-K.........................   11

           Signatures...............................................   12



                                        2





                           PARKER & PARSLEY 90-A, L.P.
                        (A Delaware Limited Partnership)

                          Part I. Financial Information

Item 1.     Financial Statements

                                 BALANCE SHEETS


                                                      June 30,     December 31,
                                                        2001           2000
                                                    -----------    -----------
                                                    (Unaudited)
                 ASSETS

                                                             
Current assets:
  Cash                                              $   236,952    $    92,685
  Accounts receivable - oil and gas sales                95,199        122,067
                                                     ----------     ----------
        Total current assets                            332,151        214,752
                                                     ----------     ----------
Oil and gas properties - at cost, based on the
  successful efforts accounting method                5,085,569      5,085,185
Accumulated depletion                                (4,052,625)    (4,014,368)
                                                     ----------     ----------
        Net oil and gas properties                    1,032,944      1,070,817
                                                     ----------     ----------
                                                    $ 1,365,095    $ 1,285,569
                                                     ==========     ==========
LIABILITIES AND PARTNERS' CAPITAL

Current liabilities:
  Accounts payable - affiliate                      $    22,274    $    15,770

Partners' capital:
  Managing general partner                               13,509         12,779
  Limited partners (6,811 interests)                  1,329,312      1,257,020
                                                     ----------     ----------
                                                      1,342,821      1,269,799
                                                     ----------     ----------
                                                    $ 1,365,095    $ 1,285,569
                                                     ==========     ==========




  The financial information included as of June 30, 2001 has been prepared by
  the managing general partner without audit by independent public accountants.

   The accompanying notes are an integral part of these financial statements.

                                        3





                           PARKER & PARSLEY 90-A, L.P.
                        (A Delaware Limited Partnership)

                            STATEMENTS OF OPERATIONS
                                   (Unaudited)




                                   Three months ended         Six months ended
                                        June 30,                  June 30,
                                 ----------------------    ----------------------
                                    2001        2000         2001          2000
                                 ---------    ---------    ---------    ---------
                                                            
Revenues:
  Oil and gas                    $ 188,539    $ 178,954    $ 424,897    $ 362,257
  Interest                           1,752        2,175        3,409        3,758
  Gain on disposition of assets        -          9,419          -          9,419
                                  --------     --------     --------     --------
                                   190,291      190,548      428,306      375,434
                                  --------     --------     --------     --------
Costs and expenses:
  Oil and gas production            88,253       89,154      165,130      159,970
  General and administrative         5,824        6,057       14,385       11,738
  Depletion                         18,523       15,331       38,257       35,963
                                  --------     --------     --------     --------
                                   112,600      110,542      217,772      207,671
                                  --------     --------     --------     --------
Net income                       $  77,691    $  80,006    $ 210,534    $ 167,763
                                  ========     ========     ========     ========
Allocation of net income:
  Managing general partner       $     777    $     800    $   2,105    $   1,678
                                  ========     ========     ========     ========
  Limited partners               $  76,914    $  79,206    $ 208,429    $ 166,085
                                  ========     ========     ========     ========
Net income per limited
  partnership interest           $   11.29    $   11.62    $   30.60    $   24.38
                                  ========     ========     ========     ========





         The financial information included herein has been prepared by
  the managing general partner without audit by independent public accountants.

   The accompanying notes are an integral part of these financial statements.

                                        4





                           PARKER & PARSLEY 90-A, L.P.
                        (A Delaware Limited Partnership)

                         STATEMENT OF PARTNERS' CAPITAL
                                   (Unaudited)





                                       Managing
                                       general      Limited
                                       partner      partners       Total
                                      ---------    ----------    ----------


                                                        
Balance at January 1, 2001            $  12,779    $1,257,020    $1,269,799

    Distributions                        (1,375)     (136,137)     (137,512)

    Net income                            2,105       208,429       210,534
                                       --------     ---------     ---------

Balance at June 30, 2001              $  13,509    $1,329,312    $1,342,821
                                       ========     =========     =========





         The financial information included herein has been prepared by
  the managing general partner without audit by independent public accountants.

   The accompanying notes are an integral part of these financial statements.

                                        5





                           PARKER & PARSLEY 90-A, L.P.
                        (A Delaware Limited Partnership)

                            STATEMENTS OF CASH FLOWS
                                   (Unaudited)



                                                         Six months ended
                                                             June 30,
                                                     ------------------------
                                                        2001          2000
                                                     ----------    ----------
                                                             
Cash flows from operating activities:
  Net income                                         $  210,534    $  167,763
  Adjustments to reconcile net income to net
    cash provided by operating activities:
       Depletion                                         38,257        35,963
       Gain on disposition of assets                        -          (9,419)
  Changes in assets and liabilities:
       Accounts receivable                               26,868       (19,346)
       Accounts payable                                   6,504         5,068
                                                      ---------     ---------
         Net cash provided by operating activities      282,163       180,029
                                                      ---------     ---------
Cash flows from investing activities:
  Additions to oil and gas properties                      (384)       (4,190)
  Proceeds from asset dispositions                          -           9,419
                                                      ---------     ---------
         Net cash provided by (used in)
           investing activities                            (384)        5,229
                                                      ---------     ---------
Cash flows used in financing activities:
  Cash distributions to partners                       (137,512)     (187,276)
                                                      ---------     ---------
Net increase (decrease) in cash                         144,267        (2,018)
Cash at beginning of period                              92,685       122,649
                                                      ---------     ---------
Cash at end of period                                $  236,952    $  120,631
                                                      =========     =========





         The financial information included herein has been prepared by
  the managing general partner without audit by independent public accountants.

   The accompanying notes are an integral part of these financial statements.

                                        6





                           PARKER & PARSLEY 90-A, L.P.
                        (A Delaware Limited Partnership)

                          NOTES TO FINANCIAL STATEMENTS
                                  June 30, 2001
                                   (Unaudited)


Note 1.     Organization and nature of operations

Parker &  Parsley  90-A,  L.P.  (the  "Partnership")  is a  limited  partnership
organized in 1990 under the laws of the State of Delaware.

The  Partnership  engages in oil and gas development and production in Texas and
is not involved in any industry segment other than oil and gas.

Note 2.     Basis of presentation

In  the  opinion  of  management,  the  unaudited  financial  statements  of the
Partnership  as of June 30, 2001 and for the three and six months ended June 30,
2001 and 2000 include all  adjustments  and accruals  consisting  only of normal
recurring accrual adjustments which are necessary for a fair presentation of the
results for the  interim  period.  These  interim  results  are not  necessarily
indicative of results for a full year. Certain  reclassifications  may have been
made to the June 30, 2000  financial  statements to conform to the June 30, 2001
financial statement presentations.

Certain  information  and footnote  disclosures  normally  included in financial
statements prepared in accordance with generally accepted accounting  principles
have been  condensed  or  omitted  in this Form 10-Q  pursuant  to the rules and
regulations of the Securities and Exchange Commission.  The financial statements
should  be read in  conjunction  with the  financial  statements  and the  notes
thereto  contained in the  Partnership's  Report on Form 10-K for the year ended
December 31, 2000, as filed with the Securities and Exchange Commission,  a copy
of which is available upon request by writing to Rich Dealy,  Vice President and
Chief Accounting  Officer,  5205 North O'Connor  Boulevard,  Suite 1400, Irving,
Texas 75039-3746.

Item 2.     Management's Discussion and Analysis of Financial Condition
              and Results of Operations (1)

Results of Operations

Six months ended June 30, 2001 compared with six months ended
   June 30, 2000

Revenues:

The  Partnership's  oil and gas revenues  increased  17% to $424,897 for the six
months  ended June 30, 2001 as compared to $362,257 for the same period in 2000.
The increase in revenues resulted from higher average prices received, offset by
a decrease in production.  For the six months ended June 30, 2001, 8,803 barrels

                                        7





of oil, 3,690 barrels of natural gas liquids ("NGLs") and 23,539 mcf of gas were
sold, or 16,416  barrel of oil  equivalents  ("BOEs").  For the six months ended
June 30, 2000, 8,965 barrels of oil, 5,338 barrels of NGLs and 19,897 mcf of gas
were sold, or 17,619 BOEs.

The average price received per barrel of oil increased  $.43, or 2%, from $27.46
for the six months  ended June 30,  2000 to $27.89 for the same  period in 2001.
The average  price  received per barrel of NGLs  increased  $3.31,  or 24%, from
$13.56  during the six months  ended June 30, 2000 to $16.87 for the same period
in 2001.  The average price  received per mcf of gas  increased  126% from $2.20
during the six months  ended June 30, 2000 to $4.98 for the same period in 2001.
The market price for oil and gas has been extremely  volatile in the past decade
and  management  expects  a certain  amount of  volatility  to  continue  in the
foreseeable  future.  The  Partnership may therefore sell its future oil and gas
production at average  prices lower or higher than that received  during the six
months ended June 30, 2001.

Gain on  disposition  of assets of $9,419 was  recognized  during the six months
ended June 30,  2000  resulting  from  equipment  credits  received on one fully
depleted well.

Costs and Expenses:

Total costs and expenses increased to $217,772 for the six months ended June 30,
2001 as  compared  to  $207,671  for the same  period in 2000,  an  increase  of
$10,101, or 5%. This increase was due to increases in production costs,  general
and administrative expenses ("G&A") and depletion.

Production  costs  were  $165,130  for the six months  ended  June 30,  2001 and
$159,970 for the same period in 2000 resulting in a $5,160 increase,  or 3%. The
increase was due to higher  production  taxes associated with higher oil and gas
prices  and  additional  well  maintenance  costs  incurred  to  stimulate  well
production, offset by a decrease in workover costs.

G&A's  components are independent  accounting and engineering  fees and managing
general partner personnel and operating costs. During this period, G&A increased
23%, from $11,738 for the six months ended June 30, 2000 to $14,385 for the same
period in 2001,  primarily due to a higher  percentage  of the managing  general
partner's  G&A being  allocated  (limited  to 3% of oil and gas  revenues)  as a
result of increased oil and gas revenues and an increase in audit and tax fees.

Depletion  was  $38,257  for the six months  ended June 30,  2001 as compared to
$35,963 for the same period in 2000, an increase of $2,294, or 6%. This increase
was primarily due to a reduction in proved reserves during the period ended June
30, 2001 as a result of lower commodity prices.

Three months ended June 30, 2001 compared with three months ended June 30, 2000

Revenues:

The  Partnership's  oil and gas revenues  increased 5% to $188,539 for the three
months  ended June 30, 2001 as compared to $178,954 for the same period in 2000.
The increase in revenues  resulted from higher average  prices  received for gas
and NGLs,  offset by lower  average  prices  received  for oil and a decrease in
production.  For the three  months  ended  June 30, 2001,  4,081 barrels of oil,

                                        8





2,147  barrels of NGLs and 11,701 mcf of gas were sold,  or 8,178 BOEs.  For the
three months ended June 30, 2000,  4,198  barrels of oil,  2,815 barrels of NGLs
and 10,000 mcf of gas were sold, or 8,680 BOEs.

The average price received per barrel of oil decreased  $.22, or 1%, from $27.54
for the three  months ended June 30, 2000 to $27.32 for the same period in 2001.
The average  price  received per barrel of NGLs  increased  $1.69,  or 13%, from
$13.36 during the three months ended June 30, 2000 to $15.05 for the same period
in 2001.  The average  price  received per mcf of gas  increased  49% from $2.57
during  the three  months  ended June 30,  2000 to $3.82 for the same  period in
2001.

Gain on disposition  of assets of $9,419 was recognized  during the three months
ended June 30, 2000 from equipment credits received on one fully depleted well.

Costs and Expenses:

Total costs and  expenses  increased to $112,600 for the three months ended June
30, 2001 as compared  to  $110,542  for the same period in 2000,  an increase of
$2,058,  or 2%. This  increase  was due to an increase in  depletion,  offset by
declines in production costs and G&A.

Production  costs were  $88,253  for the three  months  ended June 30,  2001 and
$89,154 for the same period in 2000  resulting  in a $901  decrease,  or 1%. The
decrease was due to lower workover costs,  offset by additional well maintenance
costs incurred to stimulate well production.

During this  period,  G&A  decreased  4%, from $6,057 for the three months ended
June 30, 2000 to $5,824 for the same period in 2001, primarily due to a decrease
in audit and tax fees.

Depletion  was $18,523 for the three  months  ended June 30, 2001 as compared to
$15,331  for the same  period in 2000,  an  increase  of  $3,192,  or 21%.  This
increase was primarily due to a reduction in proved  reserves  during the period
ended June 30, 2001 as a result of lower commodity prices.

Liquidity and Capital Resources

Net Cash Provided by Operating Activities

Net cash  provided by operating  activities  increased  $102,134  during the six
months  ended  June 30,  2001 from the same  period  ended June 30,  2000.  This
increase  was due to an increase of $62,291 in oil and gas sales  receipts and a
reduction of $47,650 in working capital, offset by increases in production costs
of $5,160 and G&A  expenses  of $2,647.  The  increase  in oil and gas  receipts
resulted from the increase in commodity prices during 2001 which  contributed an
additional $76,480 to oil and gas receipts, offset by $14,189 resulting from the
decline in  production  during 2001 as compared to the same period in 2000.  The
increase in production  costs was primarily  due to increased  production  taxes
associated with higher oil and gas prices and additional well maintenance  costs
incurred to stimulate well  production,  offset by a decrease in workover costs.
The increase in G&A was  primarily  due to a higher  percentage  of the managing
general partner's G&A being allocated (limited to 3% of oil and gas revenues) as
a result of  increased  oil and gas  revenues  and an  increase in audit and tax
fees.

                                        9





Net Cash Provided by (Used in) Investing Activities

The  Partnership's  principal  investing  activities during the six months ended
June 30, 2001 and 2000 were for  expenditures  related to equipment  upgrades on
active oil and gas properties.

Proceeds  of $9,419  recognized  during the six months  ended June 30, 2000 were
from equipment credits on one fully depleted well.

Net Cash Used in Financing Activities

For the six months ended June 30, 2001, cash  distributions to the partners were
$137,512,  of which $1,375 was  distributed to the managing  general partner and
$136,137 to the limited partners.  For the same period ended June 30, 2000, cash
distributions to the partners were $187,276,  of which $1,873 was distributed to
the managing general partner and $185,403 to the limited partners.

For the three  months  ended June 30, 2001,  no  distributions  were made by the
partnership to its partners.  Subsequent to June 30, 2001 the cash  distribution
that  otherwise  would  have been  mailed to  partners  in late June was made to
holders  of  record  as of July 9, 2001 and was  mailed  on July 13,  2001.  For
further information, see "Proposal to acquire partnerships" below.

Proposal to acquire partnerships

On June 29, 2001,  Pioneer Natural Resources Company  ("Pioneer") filed with the
Securities and Exchange Commission  Amendment No. 1 to the Form S-4 Registration
Statement (File No. 333- 59094) (the "preliminary proxy  statement/prospectus"),
which  proposes an agreement and plan of merger among Pioneer,  Pioneer  Natural
Resources USA, Inc. ("Pioneer USA"), a wholly-owned  subsidiary of Pioneer,  and
46 Parker & Parsley limited  partnerships.  Each  partnership  that approves the
agreement and plan of merger and the other related  merger  proposals will merge
with and into Pioneer USA upon the closing of the transactions  described in the
preliminary proxy  statement/prospectus,  and the partnership  interests of each
such  partnership  will be converted  into the right to receive  Pioneer  common
stock.  The Partnership is one of the 46 Parker & Parsley  limited  partnerships
that will be asked to approve the agreement and plan of merger.  The preliminary
proxy statement/prospectus is non-binding and is subject to, among other things,
consideration  of offers from third parties to purchase any  partnership  or its
assets and the majority  approval of the limited  partnership  interests in each
partnership.

Pioneer USA will solicit  proxies  from limited  partners to approve the mergers
only when the proxy  statement/prospectus  is final and declared  effective.  No
solicitation will be made using preliminary  materials.  Nonetheless,  copies of
the preliminary proxy  statement/prospectus  may be obtained without charge upon
request from Pioneer Natural Resources Company, 5205 North O'Connor Blvd., Suite
1400, Irving, Texas 75039, Attention: Investor Relations.

The limited partners are urged to read the proxy statement/prospectus of Pioneer
filed with the Securities and Exchange Commission, when it is finalized, because
it  contains  important  information  about  the  proposed  mergers,   including
information  about the direct and indirect  interests of Pioneer USA and Pioneer
in the mergers.  The limited  partners may also obtain the preliminary and (when
filed) final proxy statement/prospectus and other relevant documents relating to

                                       10





the proposed  mergers free through the internet web site that the Securities and
Exchange Commission maintains at www.sec.gov.


- ---------------

(1)  "Item 2.  Management's  Discussion and Analysis of Financial  Condition and
     Results of Operations"  contains  forward  looking  statements that involve
     risks and uncertainties.  Accordingly,  no assurances can be given that the
     actual  events  and  results  will  not be  materially  different  than the
     anticipated results described in the forward looking statements.


                           Part II. Other Information

Item 6.     Exhibits and Reports on Form 8-K

(a)   Exhibits - none

(b)   Form 8-K - none


                                       11




                           PARKER & PARSLEY 90-A, L.P.
                        (A Delaware Limited Partnership)



                               S I G N A T U R E S



     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                          PARKER & PARSLEY 90-A, L.P.

                                 By:      Pioneer Natural Resources USA, Inc.,
                                            Managing General Partner





Dated:  August 8, 2001           By:      /s/ Rich Dealy
                                          ----------------------------------
                                          Rich Dealy, Vice President and
                                          Chief Accounting Officer




                                       12