- [Oshi No Ko] - [Mein*Star] (2023)
- O.C. California (2003)
- Oak Island - Fluch und Legende (2014)
- Obi-Wan Kenobi (2022)
- Odd Taxi (2021)
- Off Campus (2026)
- Oggy und die Kakerlaken (1999)
- On Call (2025)
- Once Upon a Time - Es war einmal ... (2011)
- One Day at a Time (2017)
- One Piece (1999)
- ONE PIECE (2023)
- One Punch Man (2015)
- One Tree Hill (2003)
- Onegai Teacher (2002)
- Only Fools and Horses (1981)
- Only Margo (2026)
- Only Murders in the Building (2021)
- Orange (2016)
- Orange Is the New Black (2013)
- Oreimo (2010)
- Orphan Black (2013)
- Our Flag Means Death (2022)
- Our Last Crusade or the Rise of a New World (2020)
- Our Sticky Love (2026)
- Ouran High School Host Club (2006)
- Outcast (2016)
- Outer Banks (2020)
- Outer Limits - Die unbekannte Dimension (1995)
- Outer Range (2022)
- Outlander (2014)
- Outlander: Blood of My Blood (2025)
- Overlord (2015)
- Oz - Hölle hinter Gittern (1997)
- Ozark (2017)
