O
- Oak Bank Elementary
- Oak Bluff Community School
- Oakburn Elementary
- Oakenwald School
- Oak Lake Community School
- Oakland Colony School
- Oak Park High School
- Oak River Colony School
- Oak River Elementary
- Oakville School
- Ochre River School
- Odanah Colony School
- Oholei Torah School
- Ohr Hatorah School
- O'Kelly School
- Omega School
- Omiishosh Memorial School
- Onanole Elementary
- Oscar Blackburn School
- Otetiskewin Kiskinwamahtowekamik School
- Otter Nelson River School
- Our Lady of Victory School
- O. V. Jewitt Elementary
- Oxford House Elementary School