UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q/A

(Amendment No. 1)

For the quarterly period ended December 31, 2012

OR

For the transition period from                     to                     

Commission File Number 001-31617

Bristow Group Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code:

(713) 267-7600

None

(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  ¨

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  ¨

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.

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

Indicate the number shares outstanding of each of the issuer’s classes of Common Stock, as of April 5, 2013.

36,150,639 shares of Common Stock, $.01 par value

Explanatory Note

This Amendment No. 1 to Quarterly Report on Form 10-Q (this “Amendment”) amends the Company’s Quarterly Report on Form 10-Q for the quarterly period ended December 31, 2012 that was originally filed on February 4, 2013 (the “Original Form 10-Q”).

This Amendment is being filed solely to provide a revised copy of Exhibit 10.1 that was included with the Original Form 10-Q in response to comments from the U.S. Securities and Exchange Commission in connection with the Company’s confidential treatment request.

No other changes have been made to the Original Form 10-Q by this Amendment. This Amendment speaks as of the original filing date of the Original Form 10-Q, does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way disclosures made in the Original Form 10-Q.

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The following exhibits are filed as part of this Quarterly Report:

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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.

April 8, 2013

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Index to Exhibits.

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