(1824-1901), grandnephew of John Taylor Gilman and Nicholas Gilman, was a U.S. Representative born in Exeter, Rockingham County, New Hampshire on February 26, 1824. He attended Phillips Exeter Academy in Exeter, New Hampshire where he pursued classical studies. Gilman was graduated from Harvard Law School, was admitted to the bar in 1850 and commenced practice in Exeter, New Hampshire.
A member of the House of Representatives of New Hampshire in 1851 and 1852, he moved to Brunswick continuing his law practice. Gilman became a member of the Maine House of Representatives in 1854 and 1855, and was a member of the State Whig committee.
Elected as a Republican to the Thirty-fifth Congress (March 4, 1857-March 3, 1859), he declined to be a candidate for renomination in 1858. Gilman was a delegate to the Republican National Convention in 1860. Interested in introducing waterworks and other public improvements, he died in Brunswick on February 5, 1901, with interment in Pine Grove Cemetery.