O
- Oakbank
- Oak Brae
- Oakburn
- Oak Lake
- Oak Lake 59
- Oak Lake 59A
- Oakland
- Oakland-Wawanesa
- Oako Beach
- Oak Point
- Oak River
- Oakview
- Oakview, Division No. 15
- Oakville
- Oberon
- Ochre River
- Odanah
- Odhill
- Ogilvie
- Ohpahahpiskow Saskahgan Indian Reserve
- Okno
- Oldenberg
- Old England
- Olha
- Omineeseenowenik
- Onanole
- Opaskwayak C.N. 21D
- Opaskwayak C.N. 21F
- Opaskwayak C.N. 21G
- Opaskwayak C.N. 21J
- Opaskwayak C.N. 21K
- Opaskwayak C.N. 21L
- Opaskwayak C.N. 21N
- Opaskwayak C.N. 21P
- Opaskwayak C.N. 21 (Stony Point)
- Opaskwayak C.N. Root Lake 231
- Opaskwayak C.N. Salt Channel 21D
- Opaskwayak Cree Nation 21A
- Opaskwayak Cree Nation 21B
- Opaskwayak Cree Nation 21C
- Opaskwayak Cree Nation 21E
- Opaskwayak Cree Nation 21I
- Opekamank
- Opekanowi Sakaheykun Indian Reserve
- Opekunosakakanihk Indian Reserve
- O-Pipon-Na-Piwin Cree Nation 1
- Opischikonayak Nation Indian Reserve
- Ostenfeld
- Oswald
- Otterburne
- Otter Falls
- Otto
- Overflowing River Sapotaweyak Cree Nation Indian Reserve
- Overstoneville
- Overton
- Oxford House 24
- Oxford House 24A
- Oxford House 24D
- Oxford House Indian Reserve 24B
- Oxford House Indian Reserve 24C
- Oxford Lake North Shore Indian Reserve
- Ozerna
