U.S. SECURITIES AND EXCHANGE COMMISSION

Washington, D. C. 20549

FORM 10-Q/A

Amendment No. 1

(Mark One)

For the fiscal quarter ended                 June 30, 2012

For the transition period from                              to

RIO BRAVO OIL, INC.

(Exact name of small business issuer as specified in its charter)

5858 Westheimer, Suite 699, Houston, TX 77057
(Address of principal executive offices) (Zip code)

Issuer’s telephone number: (713) 787-9060
Securities registered under Section 12(g) of the Exchange Act:

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 T No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes T No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

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

There were 32,291,657 shares outstanding of registrant’s common stock, par value $0.001 per share, as of August 1, 2012.

Transitional Small Business Disclosure Format (check one): Yes o No T

Explanatory Note: The sole purpose of this Amendment to Rio Bravo Oil, Inc.’s Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2012, filed with the Securities and Exchange Commission on August 20, 2012 (the “Form 10-Q”), is to provide the consolidated financial statements and related notes from the Form 10-Q formatted in XBRL (eXtensible Business Reporting Language) to furnish Exhibit 101 to the Form 10-Q in accordance with Rule 405 of Regulation S-T. Exhibit 101 to this report provides the consolidated financial statements and related notes from the Form 10-Q formatted in XBRL. No other changes have been made to the Form 10-Q.

Pursuant to Rule 406T of Regulation S-T, the interactive data files on Exhibit 101 hereto are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Act of 1934, as amended, and otherwise are not subject to liability under those sections.

ITEM 6. EXHIBITS

Index to Exhibits

SIGNATURES

In accordance with Section 13 or 15(d) of the Exchange Act, the registrant caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, on September 6, 2012.