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- Oak Township, Canadian County
- Oakdale Township, Noble County
- Oakdale Township, Washita County
- Oakes Township, Choctaw County
- Oakview Township, Logan County
- O'Bryan Township, Woods County
- Octavia Township, Le Flore County
- Odell Township, Marshall County
- Ogle Township, Muskogee County
- Ohio Township, Ellis County
- Okemah Township, Okfuskee County
- Okfuskee Township, Okfuskee County
- Oklahoma Township, Oklahoma County
- Oleta Township, Ellis County
- Olive Township, Creek County
- Olive Township, Garfield County
- Oliver Township, Ellis County
- Olustee Township, Jackson County
- Omega Township, Kingfisher County
- Oolagah Township, Rogers County
- Oowalah Township, Rogers County
- Optima Township, Texas County
- Orlando Township, Logan County
- Osage Township, Lincoln County
- Osborn Township, Garfield County
- Otoe Township, Lincoln County
- Otoe Township, Noble County
- Otoe Township, Pawnee County
- Ottawa Township, Ottawa County
- Otter Township, Ellis County
- Otter Township, Garfield County
- Otter Township, Harper County
- Otter Township, Kingfisher County
- Otter Creek Township, Kiowa County
- Owasso Township, Tulsa County
- Owen Township, Kay County
Read more about this topic: List Of Oklahoma Townships