- Onion SportsDome
- Only Fools and Horses
- Only in America with Larry the Cable Guy
- The Only Way is Essex
- On the Air
- On the Lot
- On the Road With Austin & Santino
- Ookami Kakushi
- Ookiku Furikabutte
- Operation Repo
- Opposite Sex
- The Oprah Winfrey Show
- Orange Days
- Oretachi ni Tsubasa wa Nai
- Origins of Us
- Orphen
- Orthros no Inu
- Oruchuban Ebichu
- Os Aspones
- The Osbournes