K-1 World Grand Prix 2009 in Seoul Final 16 was a martial arts event held by the K-1 on Saturday, September 26, 2009 at the Olympic Gymnastics Arena in Seoul, Korea.

It was the Final Elimination tournament for top sixteen fighters.

The winners qualified for the K-1 World Grand Prix 2009 Final held on December 5, 2009 at Yokohama Arena, Japan.

[1] The eight finalists from K-1 World Grand Prix 2008 Final were automatically qualified, except Gokhan Saki who could not compete due to an injury, the eighth spot was filled by K-1 Super-heavyweight champion, Semmy Schilt, then four World GP 2009 tournament winners from the Yokohama, Lodz, Seoul and Final 16 Qualifying GP.

The last four spots were selected by fan voting.