B
- Belleville
- Blind River
- Brighton
- Bruce Mines
- (Parry Sound District) Burk's Falls
- (Frontenac County) Barriefield
- (Frontenac County) Battersea
- (Peterborough County) Bailieboro
- (Kawartha Lakes) Burnt River
- (Hastings County) Baptiste
- (Lambton County) Babys Point
- (Regional Municipality of Waterloo) Baden
- (Wellington County) Badenoch
- (Parry Sound District) Badger's Corners
- (Grey County) Badjeros
- (Renfrew County) Balaclava
- (District Municipality of Muskoka) Bala Park
- (Lanark County) Balderson
- (Thunder Bay District) Ball Island
- (United Counties of Leeds and Grenville) Ballycanoe
- (Simcoe County) Ballycroy
- (Middlesex County) Ballymote
- (Grey County) Balmy Beach
- (Renfrew County) Balsam Hill
- (Renfrew County) Balvenie
- (Parry Sound District) Banbury
- (Dufferin County) Banda
- (Oxford County) Banner
- (Hastings County) Bannockburn
- (Comtés unis de Prescott et Russell) Barb