Thomas Guthrie Marquis (July 7, 1864–April 1, 1936) was a Canadian historian.
Marquis was born in Chatham, New Brunswick.
His parents were Hugh P. Marquis and Mary McIndoe.
He attended school in Chatham but at age 16 he went to Queen's University, Kingston, where he graduated in 1889.
He worked briefly in Ottawa as an editorial writer with the Ottawa Free Press but went to Toronto where he worked as a freelance writer.