Thomas Amory Deblois Fessenden (January 23, 1826 – September 28, 1868) was an American politician.
He then studied law and was admitted to the bar in April 1848.
He was a delegate to the Republican National Convention in 1856 and 1868 and a member of the Maine House of Representatives in 1860 and 1868, as well as prosecuting attorney for Androscoggin County in 1861 and 1862.
He was elected as a Republican to the 37th Congress to fill the vacancy caused by the resignation of Charles W. Walton and served from December 1, 1862, to March 3, 1863, and was not a candidate for renomination in 1862.
He died in Auburn, and is interred in Evergreen Cemetery, Portland, Maine.