George Gilman Fogg (May 26, 1813 – October 5, 1881) was an American politician and diplomat who served as a member of the United States Senate for New Hampshire from 1866 to 1867.

The son of David Fogg and Hannah Gilman Vickery, he was born May 26, 1813, in Meredith, New Hampshire.

After being admitted to the bar, Fogg commenced practice in Gilmanton Ironworks, New Hampshire.

Fogg was secretary of the Republican National Executive Committee in 1860, and was appointed by President Abraham Lincoln as Minister Resident to Switzerland, holding that office from 1861 to 1865.

He was appointed as a Republican to the U.S. Senate to fill the vacancy caused by the resignation of Daniel Clark and served from August 31, 1866, to March 3, 1867; he was not a candidate for election to the Senate in 1866.