RIZIN 15 live from the Yokohama Arena in Yokohama, Japan. The promotion returns to Yokohama for the first time in two years with many of the biggest stars in the promotion. The inaugural Rizin light heavyweight title will be on the line when 2015 RIZIN Heavyweight GP winner King Mo meets the man he defeated to win the grand prix, Jiří Procházka. In the night’s co-headliner, RIZIN bantamweight champion Kyoji Horiguchi takes on former UFC flyweight Ben Nguyen. Since leaving the UFC with a 7-1 record, Horiguchi has won eight straight fights, including stoppages over Bellator champ Darrion Caldwell, former consensus No. 1 flyweight Ian McCall, and former King of Pancrase Shintaro Ishiwatari.
| Actor | Role |
|---|---|
 Jiří ProcházkaNot listed | Not listed |
 Muhammed LawalKing Mo | King Mo |
 Tenshin NasukawaNot listed | Not listed |
| FFritz Aldin BiagtanNot listed | Not listed |
 Kyoji HoriguchiNot listed | Not listed |
| BBen NguyenNot listed | Not listed |
 Roberto de SouzaNot listed | Not listed |
| SSatoru KitaokaNot listed | Not listed |
| KKarl AlbrektssonNot listed | Not listed |
| CChristiano FrohlichNot listed | Not listed |
| RRena KubotaNot listed | Not listed |
| SSamantha Jean-FrancoisNot listed | Not listed |
 Mikuru AsakuraNot listed | Not listed |
| LLuiz GustavoNot listed | Not listed |
 Kana WatanabeNot listed | Not listed |
| JJustyna HabaNot listed | Not listed |
 Damien BrownNot listed | Not listed |
| KKoji TakedaNot listed | Not listed |
 Manel KapeNot listed | Not listed |
| SSeiichiro ItoNot listed | Not listed |
 Kanako MurataNot listed | Not listed |
| SSaray OrozcoNot listed | Not listed |
| TThalisson FerreiraNot listed | Not listed |
| TTaiga KawabeNot listed | Not listed |