Thomas Treadwell Davis (August 22, 1810 – May 2, 1872) was an American lawyer and politician in the U.S. state of New York. He served as a United States Representative from New York during the latter half of the American Civil War and the subsequent beginning of Reconstruction.
Davis was born in Middlebury, Vermont, and moved to New York in 1817 with his parents who eventually settled in Clinton. He attended Clinton Academy and graduated from Hamilton College in 1831. Davis then moved to Syracuse, studied law, and was admitted to the bar. He began the practice of law in Syracuse.
He held many political positions in New York and was elected as a Unionist candidate to the 38th Congress. Davis was re-elected as a Republican to the 39th Congress, serving from March 4, 1863 to March 3, 1867. He was not a candidate for renomination in 1866 and after leaving Congress he resumed the practice of law in Syracuse.