UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

Amendment No. 1

(Mark One)

For the quarterly period ended June 30, 2012

OR

For the transition period from              to             

Commission File No. 1-35097

Voyager Oil & Gas, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (406) 245-4901

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 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 x 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 definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

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

As of August 6, 2012, there were 70,103,645 shares of Common Stock, $0.001 par value per share outstanding

Explanatory Note

This Amendment No. 1 on Form 10-Q/A (“Amendment No. 1”) is an amendment to the Registrant’s Quarterly Report on Form 10-Q for the period ended June 30, 2012 (the “Report”). This Amendment No. 1 is being filed solely to add the XBRL (eXtensible Business Reporting Language) information in Exhibit 101 that was excluded from the Report. This Amendment No. 1 makes no other change to the Report as filed with the Securities and Exchange Commission on August 6, 2012.

Exhibit 101 provides the following items for the period ended June 30, 2012 formatted in XBRL: (i) the Condensed Balance Sheets, (ii) the Condensed Statements of Operations, (iii) the Condensed Statements of Cash Flows and (iv) the Notes to Condensed Financial Statements.

PART II — OTHER INFORMATION

ITEM 6. EXHIBITS

SIGNATURES

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.

EXHIBIT INDEX