Martial Art Styles J
| Name | Game | Application | Country | Author |
| Jaer Harelic | PF | Fiction | NA | Mephisto |
| Jailhouse Rock | N&S | Conversion | USA | Kuseru |
| Jarorin | PF | Fiction | NA | Mephisto |
| Jawa Fhuz's Style of Whupass | PF | Fiction | NA | Sinestus |
| Jeet Kune Do | N&S | Conversion | United States | Lee Casebolt |
| Jeet Kune Do | N&S | Conversion | United States | Kuseru |
| Jeet Kune Do | N&S | Conversion | United States | danzig138 |
| Jikishin Kage Ryu Naginata-do | N&S | Conversion | Japan | Kuseru |
| Jiu Jue Hsiong | N&S | Fiction | China | Mantisking |
| Jiu Chih Xing Kung Fu | N&S | Fiction | China | KnightFall |
| Jogo de Pau | N&S | Conversion | Portugal | Kuseru |
| Joketsuzoku | N&S | Fiction | China | Cutter Kinseeker |
| Jook Lum Tong Long Kuen | N&S | Conversion | China | Mantisking |
| Jotan Targeting | PF | Fiction | NA | Mephisto |
| Joy and Sorrow Technique | N&S | Fiction | China | danzig138 |
| Judo (Revised) | Any | Revision | Japan | JJ Fuzz |
| Jujitsu (Revised) | Any | Revision | Japan | JJ Fuzz |
| Jujutsu | Any | Quickie | Japan | Kuseru |
| Junsado | N&S | Fiction | Korea | Ronin |
Number of Styles: 19
