PRIDE 27: Inferno was a mixed martial arts event held by the PRIDE Fighting Championships. The event took place at the Osaka Castle Hall on February 1st, 2004.
- Vovchanchyn defeated Bobish via TKO (punches) at 1:45 of round 2.
- Kharitonov defeated Peterson via submission (armbar) at 1:23 of round 1.
- Rua defeated Otsuka via submission (arm-triangle choke) at 1:25 of round 1.
- Nakamura defeated Rodriguez via unanimous decision.
- Yamamoto defeated Kerr via TKO (punches) at 0:40 of round 1. Kerr knocked himself unconscious attempting a takedown.
- Herring defeated McGee via split decision.
- Filipović defeated Waterman via TKO (soccer kicks) at 4:37 of round 1.