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- Oak Grove Public School, Cushing, Payne County
- Oakdale Public School, Edmond, Oklahoma County
- Oaks-Mission Public Schools, Oaks, Delaware County
- Oilton Public Schools, Oilton, Creek County
- Okarche Public Schools, Okarche, Kingfisher County
- Okay Public Schools, Okay, Wagoner County
- Okeene Public Schools, Okeene, Blaine County
- Okemah Public Schools, Okemah, Okfuskee County
- Oklahoma City Public Schools, Oklahoma City, Oklahoma County
- Oklahoma Union Public Schools, South Coffeyville, Nowata County
- Oktaha Public Schools, Oktaha, Muskogee County
- Olive Public Schools, Drumright, Creek County
- Olney Public Schools, Clarita, Coal County
- Olustee Public Schools, Olustee, Jackson County
- Oologah-Talala Public Schools, Oologah, Rogers County
- Optima Public School, Optima, Texas County
- Osage Hills Public School, Bartlesville, Osage County
- Osage Public School, Pryor, Mayes County
- Owasso Public Schools, Owasso, Tulsa County
Read more about this topic: List Of School Districts In Oklahoma