- Obi-Wan Kenobi (2022)
- Octobre (2021)
- ODDTAXI (2021)
- Off Campus (2026)
- Oggy and the Cockroaches (1999)
- Olive et Tom (1983)
- Once Upon a Time (2011)
- Oncle Grandpa (2013)
- One Piece (1999)
- One Piece (2023)
- One-Punch Man (2015)
- Onegai teacher (2002)
- Only Fools and Horses (1981)
- Only Murders in the Building (2021)
- Onze (2017)
- Orange (2016)
- Orange Is the New Black (2013)
- Oreimo: My Little Sister Can't Be This Cute (2010)
- Orgueil et Préjugés (1995)
- Orphan Black (2013)
- Oshi no Ko (2023)
- Our Last Crusade or the Rise of a New World (2020)
- Our Sticky Love (2026)
- Ouran High School Host Club (2006)
- Ours pour un et un pour t'ours (2015)
- Outcast (2016)
- Outer Banks (2020)
- Outer Range (2022)
- Outlander (2014)
- Outlander: Blood of My Blood (2025)
- Overlord (2015)
- Oz (1997)
- Ozark (2017)
