Koji Seto
- Title: Koji Seto
- Popularity: 8.61
- Known For: Acting
- Birthday: 1988-05-18
- Place of Birth: Fukuoka, Japan
- Homepage: http://www.watanabepro.co.jp/mypage/10000023/
- Also Known As: Kōji Seto, 瀬戸康史, 濑户康史, 세토 코지, 瀨戶康史, קוג'י סטו, โคจิ เซโตะ, Koji Seto