Koji Gushiken(具志堅 幸司,Gushiken Koji; born November 12, 1956 in Osaka.?) is a former Olympic gymnast for Japan at the 1984 Summer Olympics in Los Angeles, California, where he won a total number of five medals, including two gold. He broke an ankle in May 1985 which prevented him from training for 3 months and hindered his performances at the 1985 World Championships. Gushiken announced his retirement at the 1985 Chunichi Cup. He currently coaches other Olympic contenders.