UFC 15: Collision Course was a mixed martial arts event held by the Ultimate Fighting Championship on October 17, 1997, in Bay St. Louis, Mississippi.

Abbott was brought in as a last-minute replacement for Dan Severn, who couldn't fight because of an injured hand.

UFC 15 featured a Superfight between Randy Couture and Vitor Belfort, a Heavyweight Tournament, and two alternate bouts.

The show also marked the last event to feature Bruce Beck, who had been the main play-by-play announcer starting with UFC 4.

Collision Course marked a major change in the UFC's rules, with limitations set on permissible striking areas.