People & Companies
| Name | Japanese | Role | Editions |
|---|---|---|---|
| OLM | Production | 2015, 2017 | |
| Omega Micott | Production, World sales | 2002 | |
| Omega Project | Production | 2002, 2009 | |
| Omgact Entertainment | World sales | 2014 | |
| Omiya Visual Image Production | Production | 2012 | |
| Omoi SASAKI | 佐々木想 | Director, Script | 2022 |
| OMSB | Cast | 2015 | |
| on the road films | Production | 2009 | |
| One Gate Media / 24 Bilder | Distribution | 2026 | |
| One Goose | Production, World sales | 2019 | |
| Onimaru | Cast | 2000, 2004, 2025 | |
| Onion | Production | 2012 | |
| ONIONSKIN | Director | 2013, 2018 | |
| Onohana | Director | 2014 | |
| Open Sesame | World sales | 2003, 2004, 2006, 2007, 2010, 2011, 2012, 2018, 2020, 2021 | |
| Openpictures | Distribution | 2005 | |
| Orelsan | Voice acting | 2018 | |
| Orie ICHIHASHI | Cinematography | 2025 | |
| Orine FUKUSHIMA | Voice acting | 2015 | |
| Osamu FUJISHI | Cinematography | 2015 |