K-1 World Grand Prix 2004 Final was a kickboxing event promoted by the K-1 organization.

It was the twelfth K-1 World Grand Prix final, involving twelve of the world's best K-1 fighters (four being reservists) from eight countries, with all bouts fought under K-1 Rules (100 kg/156-220 lbs).

The tournament winner was Remy Bonjasky who won his second consecutive K-1 World Grand Prix title by defeating Musashi in the final by second extra round unanimous decision in a repeat of the previous years final.

The tournament was also notable for the inclusion of Kaoklai Kaennorsing who was the youngest (21 years) and lightest (172 lbs) competitor to ever participate in a K-1 World Grand Prix final.

During the course of the competition Kaoklai managed to get to the Semi Finals by defeating the heaviest competitor at this year's finals, Mighty Mo, who weighed in at 280 lbs.