Martial Art Styles O
| Name | Game | Application | Country | Author |
| O Kage Te | N&S | Fiction | Japan | Mantisking |
| Okinawa Kenpo | N&S | Conversion | Okinawa | Kuseru |
| Olympic Fencing | N&S | Conversion | Worldwide | Flash Fire |
| Omnikage | N&S | Fiction | United States | Sinestus |
| Oni Chi Te | N&S | Fiction | Japan | Mantisking |
| Oolong Pai | N&S | Fiction | China | GigaDragon |
| Orcish Martial Arts Rough-Housing | PF | Fiction | NA | Mephisto |
| Owari Kan Ryu Sojutsu | N&S | Conversion | Japan | Kuseru |
Number of Styles: 8
