Tarja is a Finnish female given name. It may refer to
- Tarja Turunen, a Finnish singer
- Tarja Cronberg, a Finnish politician
- Tarja Halonen, a Finnish politician and President of Finland (2000-2012)
- Tarja (album), a 2004 album by German neofolk group Sonne Hagal
- Tarja (folk poetry contest), a Bengal folk poetry contest