George Thomas Marks (August 31, 1856 – May 21, 1907) was a businessman and politician in Ontario, Canada.
He was born in Bruce Mines, Canada West, the son of George Marks and Mary Traynor, and was educated at Trinity College School in Port Hope.
Marks was married twice: to Jennie Laird in 1881 and to Mary Elizabeth Rowan in 1898.
Marks was treasurer and councillor for Shuniah and then served on Port Arthur town council from 1885 to 1887.
He established a municipal electric-lighting plant and helped consolidate town debt associated with earlier public works projects.