R
- (Perth County) Rostock
- (District Municipality of Muskoka) Rostrevor
- (Ottawa) Rothwell Heights
- (Ottawa) Rothwell Village
- (Peterborough County) Round Lake
- (Renfrew County) Round Lake Centre
- (Hastings County) Rowland
- (Renfrew County) Ruby
- (Renfrew County) Ruby Mine
- (Simcoe County) Rugby
- (Peterborough County) Rush Point
- (Dufferin County) Ruskview
- (Perth County) Russeldale
- (Lambton County) Rutherford
- (Nipissing District) Rutherglen
- (Algoma) Rydal Bank
- (Hastings County) Rylstone
- (Simcoe County) Ramona
- (Ottawa) Ramsayville
- Red Lake
- (Chatham-Kent) Ridgetown
- (Ottawa) Richmond
- (Kenora District) Red Lake
- (Wellington County) Rockwood
- Renfrew
- (York) Richmond Hill