| Oda Nobunaga (1998) | J-Movie | 1998 |
TV | Oh My Jump! | J-Drama | 2018 |
| Ohikkoshi | J-Movie | 1993 |
| Oldboy | K-Movie | 2003 |
| On Your Wedding Day | K-Movie | 2018 |
| Once Upon a Time | CH-Movie | 2017 |
| Once Upon a Time in High School | K-Movie | 2004 |
| One In A Hundred Thousand | J-Movie | 2020 |
| Oneechanbara 2: The VorteX | J-Movie | 2009 |
| Oneechanbara | J-Movie | 2008 |
| Ookami Shoujo to Kuro Ouji | J-Movie | 2016 |
| Oppai Volleyball | J-Movie | 2009 |
| Orange | J-Movie | 2015 |
| Ore Monogatari!! | J-Movie | 2015 |
TV | Ore no Sukato, Doko Itta? | J-Drama | 2019 |
TV | Orient Kyuuko Satsujin Jiken | J-Drama | 2015 |
| Osama to Boku | J-Movie | 2012 |
TV | Osozaki no Himawari | J-Drama | 2012 |
| Our Shining Days | CH-Movie | 2017 |
TV | Ouran High School Host Club | J-Drama | 2011 |
| Ouran High School Host Club: La Película | J-Movie | 2012 |
| Ousama Game | J-Movie | 2011 |