Thomas B. McQueston was an Ontario politician.

McQueston was first elected to the Ontario legislature as a Liberal MPP for Hamilton-Wentworth in the 1934 provincial election that brought the Liberals to power under Mitchell Hepburn. McQuestion was appointed to cabinet as Minister of Public Works and Minister of Highways and oversaw the construction of the Queen Elizabeth Way developing the concept for the road into that of a superhighway based on the German autobahn. He also commissioned what became Ontario's Highway 401.

He left the cabinet in 1937 but returned in 1940 as Minister of Mines and then Minister of Municipal Affairs. When Gordon Daniel Conant succeeded Hepburn as Premier in October 1942, McQuestion reassumed his former portfolios of Public Works and Highways as well as retaining Municipal Affairs. He was a candidate in the 1943 Ontario Liberal leadership convention placing third and then lost his seat in the 1943 Ontario election that defeated the Liberal government of Harry Nixon.