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- (Bruce County) Brinkman's Corners
- (Middlesex County) Brinsley
- (Comtés unis de Prescott et Russell) Brisson
- (Manitoulin District) Britainville
- (District Municipality of Muskoka) Britannia
- (Ottawa) Britannia Bay
- (Ottawa) Britannia Heights
- (Parry Sound District) Broadbent
- (Perth County) Brocksden
- (Perth County) Brodhagen
- (Renfrew County) Bromley
- (Lanark County) Brooke
- (Grey County) Brooke
- (Durham) Brooklin
- (Oxford County) Brooksdale
- (Northumberland County) Brookside
- (Parry Sound District) Brooks Landing
- (District Municipality of Muskoka) Brooks Mill
- (District Municipality of Muskoka) Browns Brae
- (Oxford County) Brown's Corners
- (Oxford County) Brown's Corners
- (Wellington County) Brucedale
- (Ottawa) Bruce Farm
- (Renfrew County) Bruceton
- (Renfrew County) Brudenell
- (Renfrew County) Brumsfield
- (Perth County) Brunner
- (Middlesex County) Bryanston
- (Ottawa) Buckham's Bay
- (Frontenac County) Buck Lake