B
- (Peterborough County) Blezard
- (Ottawa) Blossom Park
- (United Counties of Leeds and Grenville) Blue Church
- (Comtés unis de Prescott et Russell) Blue Corners
- (Peterborough County) Blue Mountain
- (Wellington County) Blue Springs
- (Simcoe County) Bluewater Beach
- (Huron County) Blyth
- (Frontenac County) Bobs Lake
- (Hastings County) Bogart
- (Huron County) Bogies Beach
- (Parry Sound District) Bolger
- (Lanark County) Bolingbroke
- (Hastings County) Bonarlaw
- (Simcoe County) Bond Head
- (Frontenac County) Bon Echo
- (Renfrew County) Bonnechere
- (Simcoe County) Bonnie Beach
- (Nipissing District) Booth
- (Nipissing District) Booth Landing
- (Grey County) Boothville
- (Simcoe County) Borden
- (Frontenac County) Bordenwood
- (Perth County) Bornholm
- (Middlesex County) Bornish
- (Haliburton County) Boskung
- (Wellington County) Bosworth
- (Hastings County) Boulter
- (Parry Sound District) Bourdeau
- (Ottawa) Bowesville