K-1 Grand Prix '98 Final Round was a martial arts event promoted by the K-1. The event was held at the Tokyo Dome in Tokyo, Japan on Sunday, December 13, 1998 in front of 63,800 spectators. It was the sixth K-1 World Grand Prix final involving eight of the world's best heavyweight fighters (+95 kg/209 lbs), with all bouts fought under K-1 Rules. The eight finalists had all qualified via elimination fights at the K-1 World Grand Prix '98 Opening Round. Also on the card was a number of 'Freshman Fights' fought under a mixture of Jiu-Jitsu Freestyle and K-1 Rules (various weight classes). In total there were eighteen fighters at the event, representing seven countries.