Tetsu could refer to:
- Tetsu, a gaijin.
- Tetsu, a smither.
- Tetsu, the Rokugani term for Iron.
- Akodo Tetsu, the Lion commander of the Tsai district.
- Shiba Tetsu, the Phoenix bushi.
- Tetsu Kama, the Dragon Iron Mountain.
- Tetsu Matsu, the place known as "Matsu's Judgement" at Shiro sano Ken Hayai.
- Zenshou Tetsu, the Crane fortress.