Koji Mise (Japanese: 三瀬 幸司, Hepburn: Mise Koji, born March 11, 1976) is a Japanese baseball player who played as a left-handed relief pitcher in Nippon Professional Baseball. He played for the Fukoka Hawks from 2004–2010 and the Chunichi Dragons from 2010–2014. He was named the Pacific League's Rookie of the Year for 2004, with 55 appearances, throwing 67 and 2/3 innings, a 4-3-1 record and a 3.06 ERA with 28 saves. His nickname is "Mise manager".