Tetsuo may refer to:
- Tetsuo: The Iron Man
- Tetsuo II: Body Hammer
- Tetsuo: The Bullet Man
- Tetsuo, a Japanese given name for boys.
- People
- Tetsuo Hara, manga artist
- Tetsuo Kagawa, astronomer
- Tetsuo Kutsukake, Japanese politician
- Tetsuo Shinohara, film director
- Tetsuo Sakurai, Jazz fusion bassist
- Fictional characters
- Tetsuo Kaga of Hikaru no Go
- Tetsuo Shima, of the manga, Akira
- People