| UFC Japan: Ultimate Japan | ||||
|---|---|---|---|---|
 The poster for UFC Japan: Ultimate Japan | ||||
| Promotion | Ultimate Fighting Championship | |||
| Date | December 21, 1997 | |||
| Venue | Yokohama Arena | |||
| City | Yokohama, Japan | |||
| Attendance | 5,000 | |||
| Event chronology | ||||
| ||||
UFC Japan: Ultimate Japan (also known as UFC Ultimate Japan or UFC 15.5) was a mixed martial arts event held by the Ultimate Fighting Championship on December 21, 1997, in Yokohama, Japan. The event was seen on pay per view in the United States, on cable TV in Japan, and was later released on home video.