R
- (Comtés unis de Prescott et Russell) Rockdale
- (United Counties of Leeds and Grenville) Rockfield
- (Grey County) Rockford
- (Renfrew County) Rockingham
- (Grey County) Rock Mills
- (Oxford County) Rock's Mills
- (United Counties of Leeds and Grenville) Rocksprings
- (Parry Sound District) Rockwynn
- (Ottawa) Rocky Point
- (Grey County) Rocky Saugeen
- (Elgin County) Rodney
- (United Counties of Leeds and Grenville) Roebuck
- (Lambton County) Rokeby
- (Oxford County) Rosanna
- (Renfrew County) Rosebank
- (Frontenac County) Rosedale
- (Lanark County) Rosedale
- (Regional Municipality of Niagara) Rosedene
- (Lennox and Addington County) Rose Hill
- (Simcoe County) Rosemont
- (Regional Municipality of Waterloo) Rosendale
- (Northumberland County) Roseneath
- (Renfrew County) Rosenthal
- (Parry Sound District) Rose Point
- (Lanark County) Rosetta
- (Durham) Roseville
- (District Municipality of Muskoka) Rossclair
- (Parry Sound District) Rosseau
- (District Municipality of Muskoka) Rosseau Falls
- (Parry Sound District) Rosseau Road