B
- (Ottawa) Billings Bridge
- (Grey County) Birdell
- (Peterborough County) Birdsalls
- (Wellington County) Birge Mills
- (District Municipality of Muskoka) Birkendale
- (Lambton County) Birnam
- (Middlesex County) Birr
- (Lennox and Addington County) Bishop Corners
- (United Counties of Leeds and Grenville) Bishop Islands
- (Regional Municipality of Niagara) Bismarck
- (United Counties of Leeds and Grenville) Bisseltown
- (Renfrew County) Bissett Creek
- (Dufferin County) Black Bank
- (Ottawa) Blackburn Hamlet
- (Renfrew County) Black Donald
- (Rainy River District) Black Hawk
- (United Counties of Leeds and Grenville) Black Rapids
- (Lanark County) Blacks Corners
- (Dufferin County) Blacks Corners
- (Parry Sound District) Blackstone Lake
- (Durham) Blackwater
- (Haliburton County) Blairhampton
- (United Counties of Leeds and Grenville) Blairs Settlement
- (Peterborough County) Blairton
- (United Counties of Leeds and Grenville) Blanchards Hill
- (Nipissing District) Blanchard's Landing
- (Oxford County) Blandford Station
- (Perth County) Blanshard
- (Grey County) Blantyre
- (Hastings County) Blessington