Brent J. St. Denis (born May 27, 1950) is a Canadian politician.
Born in Blind River, Ontario, St. Denis is a former executive assistant, industrial engineer, and teacher.
He is a former parliamentary secretary to the Minister of Natural Resources and the Minister of Transport, and also served as chair of the House of Commons' standing committee on industry, science, and technology, as well as that committee's subcommittee on agenda and procedure.
In the 2008 federal election, St. Denis lost his seat to Carol Hughes of the New Democratic Party, whom he had defeated in 2004 and 2006.
He is currently employed as clerk and treasurer for the township of Cockburn Island.