G
- (Lambton County) Grays
- (Simcoe County) Grays Bay
- (United Counties of Leeds and Grenville) Gray's Beach
- (Nipissing District) Great Desert
- (Ottawa) Greely
- (Ottawa) Greenboro
- (United Counties of Leeds and Grenville) Greenfield
- (Regional Municipality of Waterloo) Greenfield
- (Ottawa) Green Island
- (Renfrew County) Green Lake
- (Ottawa) Greenlands
- (Comtés unis de Prescott et Russell) Green Lane
- (Northumberland County) Greenleys Corners
- (Wellington County) Green Park
- (Hastings County) Greenview
- (Middlesex County) Greenway
- (Renfrew County) Greenwood
- (District Municipality of Muskoka) Gregory
- (United Counties of Leeds and Grenville) Grenadier Island
- (Simcoe County) Grenfell
- (Ottawa) Grenfell Glen
- (Northumberland County) Griffis Corners
- (Renfrew County) Griffith
- (Elgin County) Grimmonds Beach
- (Regional Municipality of Niagara) Grimsby Centre
- (Manitoulin District) Grimsthorpe
- (Grey County) Grimston
- (Algoma) Gros Cap
- (District Municipality of Muskoka) Grove Park
- (Elgin County) Grovesend