EXHIBIT 31.1: Certification of Chief Executive Officer pursuant to 18
U.S.C.ss.1850 as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of
2002.

                           CERTIFICATION PURSUANT TO
                            18 U.S.C. SECTION 1350,
                            AS ADOPTED PURSUANT TO
                 SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Murray N. Conradie, certify that:

1.  I have reviewed this June 30, 2005 quarterly report on Form 10-QSB of South
Texas  Oil Company (the "Company");

2. Based on my knowledge,  this report does not contain any untrue statement of
a  material  fact or omit to state  a  material  fact  necessary  to  make  the
statements made,  in  light  of  circumstances under which such statements were
made, not misleading with respect to the period covered by this report; and

3.  Based  on  my  knowledge, the financial  statements,  and  other  financial
information included  in this quarterly report,  fairly present in all material
respects the financial condition, results of operations  and  cash flows of the
Company as of, and for, the periods presented in this report.

4.  The  Company's  other  certifying  officers  and  I,  are  responsible  for
establishing and maintaining disclosure controls and procedures  (as defined in
Exchange Act Rules 13a-14 and 15d-14) for the Company and have:

a) designed such disclosure controls and procedures, or caused such  disclosure
controls  and  procedures to be designed under our supervision, to ensure  that
material information  relating  to  the  Company,  including  its  consolidated
subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;

b)  evaluated  the  effectiveness  of  the  Company's  disclosure controls  and
procedures and presented in this report our conclusions about the effectiveness
of the disclosure controls and procedures, as of the end  of the period covered
by this report based on such evaluation; and

c) disclosed in this report any change in the Company's internal  control  over
financial  reporting  that  occurred  during  the  Company's most recent fiscal
quarter  that has materially affected, or is reasonably  likely  to  materially
affect, the Company's internal control over financial reporting;

5. The Company's  other  certifying officers and I have disclosed, based on our
most recent evaluation of  internal  control  over  financial reporting, to the
Company's auditors and the audit committee of Company's  board of directors (or
persons performing the equivalent functions);

a) all significant deficiencies in the design or operation of internal controls
which  could  adversely  affect  the  Company's  ability  to  record,  process,
summarize  and  report  financial  data  and have identified for the  Company's
auditors any material weaknesses in internal controls; and

b)  any  fraud,  whether or not material, that  involves  management  or  other
employees who have  a  significant role in the Company's internal controls over
financial reporting.


                         /s/ Murray N. Conradie
                         -------------------------------------------
                         MURRAY N. CONRADIE, Chief Executive Officer

Dated: August 10, 2005