----

| Delaware                                       |   | 75-2220097               |
|------------------------------------------------|--------|--------------------------|
| (State      or other jurisdiction              |   | (I.R.S.      Employer    |
| of      incorporation or organization)         |   | Identification      No.) |
|                                           |   |                     |
| 6 Desta Drive, Suite 6500, Midland,      Texas |   | 79705                    |
| (Address      of principal executive office)   |   | (Zip      Code)          |

| Indicate      by check mark whether 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:YesxNo¨ |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Indicate      by check mark whether the registrant is a large accelerated filer, an      accelerated filer, or a non-accelerated filer.  See definition      of “accelerated filer and large accelerated filer” in Rule 12b-2 of the      Exchange Act. |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Large      accelerated filer ¨                                                                                                                                                                                                                                           |   | Accelerated      filer ¨ |   | Non-accelerated      filer x |   | Smaller      reporting company ¨ |

| Indicate      by check mark whether the registrant is a shell company (as defined in      Rule 12b-2 of the Exchange Act). |
|----------------------------------------------------------------------------------------------------------------------------|
| ¨    Yes                                                                                                              | x  No |

----

|          | Table of Contents                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |
|---------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | Page   |
|          | Glossary                                                                                                                                                                            | 3      |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
|          | Part      I - FINANCIAL INFORMATION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |   |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      1.  | Financial      Statements                                                                                                                                                           | 5      |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
|          | Balance Sheets as of June 30, 2008 and December 31,      2007                                                                                                                       | 6      |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
|          | Statements of Operations for the three months and six months      ended June 30, 2008 and 2007                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 7      |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
|          | Statements of Cash flows for the six months ended June 30, 2008      and 2007                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 8      |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      2.  | Management’s Discussion and Analysis of Financial Condition      and Results of Operations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 11     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      3.  | Quantitative and Qualitative Disclosures About Market      Risk                                                                                                                     | 16     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      4.  | Controls and      Procedures                                                                                                                                                        | 16     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
|          | Part      II – OTHER INFORMATION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      1.  | Legal      Proceedings                                                                                                                                                              | 18     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      1A. | Risk      Factors                                                                                                                                                                   | 18     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      2.  | Unregistered Sales of Equity Securities and Use of      Proceeds                                                                                                                    | 18     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      3.  | Defaults Upon Senior      Securities                                                                                                                                                | 18     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      4.  | Submission of Matter to a Vote of Security      Holders                                                                                                                             | 18     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      5.  | Other      Information                                                                                                                                                              | 18     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Item      6.  | Exhibits                                                                                                                                                                            | 18     |
|          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
|          | Signatures                                                                                                                                                                          | 19     |

----

ossary

----

----

nancial

----

Southwest 

|                                          |   | June      30, |      |   | December      31, |   |
|-----------------------------------------------|--------|---------------|-----------|--------|-------------------|--------|
|                                          |   | 2008          |      |   | 2007              |   |
|                                          |   | (unaudited)   |      |   |              |   |
| Assets                                        |   |          |      |   |              |   |
| Current      assets:                          |   |          |      |   |              |   |
| Cash and cash      equivalents                |   | $             | 97,690    |   |              | $      | 112,867 |   |
| Receivable from Managing General      Partner |   |          | 813,630   |   |              |   | 345,275 |   |
| Total current      assets                     |   |          | 911,320   |   |              |   | 458,142 |   |
|                                          |   |          |      |   |              |   |   |   |
| Oil      and gas properties - using the full- |   |          |      |   |              |   |   |   |
| cost method of      accounting                |   |          | 5,602,004 |   |              |   | 5,733,195 |   |
| Less accumulated      depreciation,           |   |          |      |   |              |   |   |   |
| depletion and      amortization               |   |          | 5,134,483 |   |              |   | 5,122,206 |   |
| Net oil and gas      properties               |   |          | 467,521   |   |              |   | 610,989 |   |
|                                          |   |          |      |   |              |   |   |   |
|                                          |   | $             | 1,378,841 |   |              | $      | 1,069,131 |   |
|                                          |   |          |      |   |              |   |   |   |
| Liabilities and      Partners' Equity         |   |          |      |   |              |   |   |   |
|                                          |   |          |      |   |              |   |   |   |
| Asset      retirement obligation              |   | $             | 551,333   |   |              | $      | 664,205 |   |
|                                          |   |          |      |   |              |   |   |   |
| Partners'      equity:                        |   |          |      |   |              |   |   |   |
| General partner                               |   |          | 63,050    |   |              |   | 19,564 |   |
| Limited partners                              |   |          | 764,458   |   |              |   | 385,362 |   |
| Total partners'      equity                   |   |          | 827,508   |   |              |   | 404,926 |   |
|                                          |   |          |      |   |              |   |   |   |
|                                          |   | $             | 1,378,841 |   |              | $      | 1,069,131 |   |

----

Gas Income 

|                                          |   | Three      Months Ended |      |   | Six      Months Ended |   |
|-----------------------------------------------|--------|-------------------------|-----------|--------|-----------------------|--------|
|                                          |   | June      30,           |      |   | June      30,         |   |
|                                          |   | 2008                    |      |   | 2007                  |   |   | 2008 |   |   | 2007 |   |
| Revenues                                      |   |                    |      |   |                  |   |   |   |   |   |   |   |
|                                          |   |                    |      |   |                  |   |   |   |   |   |   |   |
| Oil      and gas                              |   | $                       | 1,367,871 |   |                  | $      | 695,287 |   |   | $ | 2,452,823 |   |   | $ | 1,216,311 |   |
| Interest                                      |   |                    | 515       |   |                  |   | 1,770 |   |   |   | 1,289 |   |   |   | 2,849 |   |
|                                          |   |                    | 1,368,386 |   |                  |   | 697,057 |   |   |   | 2,454,112 |   |   |   | 1,219,160 |   |
|                                          |   |                    |      |   |                  |   |   |   |   |   |   |   |   |   |   |   |
| Expenses                                      |   |                    |      |   |                  |   |   |   |   |   |   |   |   |   |   |   |
|                                          |   |                    |      |   |                  |   |   |   |   |   |   |   |   |   |   |   |
| Production                                    |   |                    | 362,605   |   |                  |   | 252,019 |   |   |   | 581,006 |   |   |   | 431,109 |   |
| Depreciation,      depletion and amortization |   |                    | 4,840     |   |                  |   | 7,019 |   |   |   | 12,277 |   |   |   | 13,683 |   |
| Accretion      expense                        |   |                    | 8,595     |   |                  |   | 13,946 |   |   |   | 19,801 |   |   |   | 26,304 |   |
| General      and administrative               |   |                    | 37,170    |   |                  |   | 33,298 |   |   |   | 68,446 |   |   |   | 56,684 |   |
|                                          |   |                    |      |   |                  |   |   |   |   |   |   |   |   |   |   |   |
|                                          |   |                    | 413,210   |   |                  |   | 306,282 |   |   |   | 681,530 |   |   |   | 527,780 |   |
|                                          |   |                    |      |   |                  |   |   |   |   |   |   |   |   |   |   |   |
| Net      income                               |   | $                       | 955,176   |   |                  | $      | 390,775 |   |   | $ | 1,772,582 |   |   | $ | 691,380 |   |
|                                          |   |                    |      |   |                  |   |   |   |   |   |   |   |   |   |   |   |
| Net      income allocated to:                 |   |                    |      |   |                  |   |   |   |   |   |   |   |   |   |   |   |
| Managing General      Partner                 |   | $                       | 96,002    |   |                  | $      | 39,779 |   |   | $ | 178,486 |   |   | $ | 70,506 |   |
|                                          |   |                    |      |   |                  |   |   |   |   |   |   |   |   |   |   |   |
| Limited partners                              |   | $                       | 859,174   |   |                  | $      | 350,996 |   |   | $ | 1,594,096 |   |   | $ | 620,874 |   |
|                                          |   |                    |      |   |                  |   |   |   |   |   |   |   |   |   |   |   |
| Per limited partner      unit                 |   | $                       | 63.19     |   |                  | $      | 25.82 |   |   | $ | 117.25 |   |   | $ | 45.67 |   |

----

& Gas Income 

|                                                                    |   | Six      Month Ended |       |
|-------------------------------------------------------------------------|--------|----------------------|------------|
|                                                                    |   | June      30,        |       |
|                                                                    |   | 2008                 |       |   | 2007 |   |
| Cash      flows from operating activities:                              |   |                 |       |   |   |   |
| Cash received from oil and gas      sales                               |   | $                    | 1,984,468  |   |   | $ | 1,127,118 |   |
| Cash paid to      suppliers                                             |   |                 | (649,452   | ) |   |   | (487,855 | ) |
| Interestreceived                                                        |   |                 | 1,289      |   |   |   | 2,849 |   |
| Miscellaneous      settlement                                           |   |                 | -          |   |   |   | 121,364 |   |
| Net cash provided by operating      activities                          |   |                 | 1,336,305  |   |   |   | 763,476 |   |
|                                                                    |   |                 |       |   |   |   |   |   |
| Cash      flows used in investing activities:                           |   |                 |       |   |   |   |   |   |
| Additions to oil and gas      properties                                |   |                 | (1,482     | ) |   |   | (2,052 | ) |
|                                                                    |   |                 |       |   |   |   |   |   |
| Cash      flows used in financing activities:                           |   |                 |       |   |   |   |   |   |
| Distributions to      partners                                          |   |                 | (1,350,000 | ) |   |   | (775,000 | ) |
|                                                                    |   |                 |       |   |   |   |   |   |
| Net      decrease in cash and cash equivalents                          |   |                 | (15,177    | ) |   |   | (13,576 | ) |
|                                                                    |   |                 |       |   |   |   |   |   |
| Beginning      of period                                                |   |                 | 112,867    |   |   |   | 85,760 |   |
|                                                                    |   |                 |       |   |   |   |   |   |
| End      of period                                                      |   | $                    | 97,690     |   |   | $ | 72,184 |   |
|                                                                    |   |                 |       |   |   |   |   |   |
| Reconciliation      of net income to net                                |   |                 |       |   |   |   |   |   |
| cash provided by operating      activities:                             |   |                 |       |   |   |   |   |   |
|                                                                    |   |                 |       |   |   |   |   |   |
| Net      income                                                         |   | $                    | 1,772,582  |   |   | $ | 691,380 |   |
|                                                                    |   |                 |       |   |   |   |   |   |
| Adjustments      to reconcile net income to                             |   |                 |       |   |   |   |   |   |
| net cash provided by operating      activities:                         |   |                 |       |   |   |   |   |   |
| Depreciation, depletion and      amortization                           |   |                 | 12,277     |   |   |   | 13,683 |   |
| Accretionexpense                                                        |   |                 | 19,801     |   |   |   | 26,304 |   |
| Settlement of asset retirement      obligations                         |   |                 |       |   |   |   |   |   |
| for plugged and abandoned      wells                                    |   |                 | -          |   |   |   | (62 | ) |
| (Increase) decrease in      receivables                                 |   |                 | (468,355   | ) |   |   | 32,171 |   |
|                                                                    |   |                 |       |   |   |   |   |   |
| Net      cash provided by operating activities                          |   | $                    | 1,336,305  |   |   | $ | 763,476 |   |
|                                                                    |   |                 |       |   |   |   |   |   |
| Noncash      investing and financing activities:                        |   |                 |       |   |   |   |   |   |
|                                                                    |   |                 |       |   |   |   |   |   |
| (Decrease) increase in oil and      gas properties – SFAS No. 143 |   | $                    | (132,673   | ) |   | $ | 58,667 |   |
|                                                                    |   |                 |       |   |   |   |   |   |

----

|                                                                    | Limited  |   | General  |
|-------------------------------------------------------------------------|----------|--------|----------|
|                                                                    | Partners |   | Partners |
| Interest      income on capital contributions                           | 100%     |   | -        |
| Oil      and gas sales                                                  | 90%      |   | 10%      |
| All      other revenues                                                 | 90%      |   | 10%      |
| Organization      and offering costs (1)                                | 100%     |   | -        |
| Amortization      of organization costs                                 | 100%     |   | -        |
| Syndication      costs                                                  | 100%     |   | -        |
| Property      acquisition costs                                         | 100%     |   | -        |
| Gain/loss      on property disposition                                  | 90%      |   | 10%      |
| Operating      and administrative costs (2)                             | 90%      |   | 10%      |
| Depreciation,      depletion and amortization of oil and gas properties | 100%     |   | -        |
| All      other costs                                                    | 90%      |   | 10%      |

|   | (1) | All      organization costs in excess of 3% of initial capital contributions will      be paid by the Managing General Partner and will be treated as a capital      contribution.  The Partnership paid the Managing General Partner      an amount equal to 3% of initial capital contributions for such      organization costs. |
|--------|-----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (2) | Administrative      costs in any year, which exceed 2% of capital contributions, shall be paid      by the Managing General Partner and will be treated as a capital      contribution. |
|--------|-----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

|                                                                      |   | 2008   |     |   | 2007   |   |
|---------------------------------------------------------------------------|--------|--------|----------|--------|--------|--------|
| Beginning      of period                                                  |   | $      | 664,205  |   |   | $      | 550,489 |   |
| Additional      abandonment obligations from additional interest in wells |   |   | -        |   |   |   | 58,667 |   |
| Reduction      of obligations due to plugged and abandoned wells          |   |   | -        |   |   |   | (62 | ) |
| Additional      abandonment obligations from new wells                    |   |   | 3,779    |   |   |   | - |   |
| Revisions      of estimates                                               |   |   | (136,452 | )      |   |   | - |   |
| Accretion      expense                                                    |   |   | 19,801   |   |   |   | 26,304 |   |
| End      of period                                                        |   | $      | 551,333  |   |   | $      | 635,398 |   |

----

ment'

----

----

|                                           |   | Three      Months ended |    |
|------------------------------------------------|--------|-------------------------|---------|
|                                           |   | June      30,           |    |
|                                           |   | 2008                    |    |   | 2007 |   |
| Oil      production in barrels                 |   |                    | 10,243  |   |   |   | 9,879 |   |
| Gas      production in mcf                     |   |                    | 9,118   |   |   |   | 11,545 |   |
| Total      (BOE)                               |   |                    | 11,763  |   |   |   | 11,803 |   |
| Average      price per barrel of oil           |   | $                       | 123.02  |   |   | $ | 61.05 |   |
| Average      price per mcf of gas              |   | $                       | 11.82   |   |   | $ | 7.98 |   |
| Partnership      distributions                 |   | $                       | 700,000 |   |   | $ | 475,000 |   |
| Limited      partner distributions             |   | $                       | 630,000 |   |   | $ | 427,500 |   |
| Per      unit distribution to limited partners |   | $                       | 46.34   |   |   | $ | 31.44 |   |
| Number      of limited partner units           |   |                    | 13,596  |   |   |   | 13,596 |   |

----

|                                           |   | Six      Months Ended |      |
|------------------------------------------------|--------|-----------------------|-----------|
|                                           |   | June      30,         |      |
|                                           |   | 2008                  |      |   | 2007 |   |
| Oil      production in barrels                 |   |                  | 19,959    |   |   |   | 18,046 |   |
| Gas      production in mcf                     |   |                  | 21,431    |   |   |   | 20,960 |   |
| Total      (BOE)                               |   |                  | 23,531    |   |   |   | 21,539 |   |
| Average      price per barrel of oil           |   | $                     | 111.14    |   |   | $ | 58.35 |   |
| Average      price per mcf of gas              |   | $                     | 10.94     |   |   | $ | 7.79 |   |
| Partnership      distributions                 |   | $                     | 1,350,000 |   |   | $ | 775,000 |   |
| Limited      partner distributions             |   | $                     | 1,215,000 |   |   | $ | 697,500 |   |
| Per      unit distribution to limited partners |   | $                     | 89.36     |   |   | $ | 51.30 |   |
| Number      of limited partner units           |   |                  | 13,596    |   |   |   | 13,596 |   |

----

----

ative

Controls and

----

----

roc

Factors

stere

DefaultsUpon 

issi

ther

hibit

|   | (a) | Exhibits: |
|--------|-----|-----------|

|                         31.1 | Rule      13a-14(a)/15d-14(a) Certification                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                         31.2 | Rule      13a-14(a)/15d-14(a) Certification                                                                                                                                                  |
|                         32.1 | Certification      of Chief Executive Officer and Chief Financial Officer Pursuant to 18      U.S.C. Section 1350, as adopted Pursuant to Section 906 of the      Sarbanes-Oxley Act of 2002 |

----

NAT

|   | Southwest      Oil & Gas Income Fund VIII-A, L.P., |
|--------|--------------------------------------------------------|
|   | a Delaware      limited partnership               |
|   |                                                   |
| By:    | Southwest      Royalties, Inc., Managing               |
|   | General      Partner                                   |
|   |                                                   |
|   |                                                   |
| By:    | /s/      L. Paul Latham                                |
|   | L.      Paul Latham                                    |
|   | President      and Chief Executive Officer             |
|   |                                                   |
| Date:  | August      14, 2008                                   |