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- (Middlesex County) Three Bridges
- (Perth County) Topping
- (Grey County) Topcliff
- (District Municipality of Muskoka) Tomelin Bluffs
- (Oxford County) Tollgate
- (Simcoe County) Toanche
- (Bruce County) Tiverton
- (Simcoe County) Tioga
- (United Counties of Leeds and Grenville) Tilley
- (Frontenac County) Tichborne
- (Timiskaming District) Thwaites
- (United Counties of Leeds and Grenville) Throoptown
- (Renfrew County) Tramore
- (Lennox and Addington County) Thorpe
- (Lambton County) Thornyhurst
- (Simcoe County) Thornton
- (Middlesex County) Thorndale
- (District Municipality of Muskoka) Thorel House
- (Simcoe County) Thompsonville
- (Grey County) Thistle
- (Northumberland County) Tubbs Corners
- (Bruce County) Tara
- (Oxford County) Thamesford
- (Durham) Tyrone
- (Elgin County) Tyrconnell
- (Ottawa) Twin Elm
- (Parry Sound District) Turtle Lake
- (Cochrane District) Turn Islands
- (Ottawa) Tunney's Pasture
- (Hastings County) Tuftsville