UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

Amendment No. 1 to Form 10-Q

For the quarterly period ended March 31, 2011

or

For the transition period from              to             

Commission File Number: 000-25131

INFOSPACE, INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (425) 201-6100

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.    x  Yes    ¨  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    ¨  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 the 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    x  No

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Explanatory Note

InfoSpace, Inc. (the “Company”) is filing this Amendment No. 1 to its Quarterly Report on Form 10-Q for the period ended March 31, 2011, as originally filed with the Securities and Exchange Commission (“SEC”) on May 6, 2011 (the “Original Quarterly Report”), in response to communications received from the staff of the SEC regarding a confidential treatment request relating to Exhibit 10.2, Yahoo! Publisher Network Contract #1-23975446. Part II, Item 6 of the Original Quarterly Report is hereby amended to include a revised version of Exhibit 10.2.

There have been no changes to the Original Quarterly Report other than those described above.

Item 6. - Exhibits

INDEX TO 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 hereunto duly authorized.