Utu or UTU can refer to the following things:
- Utu, a Sumerian deity
- Utu language
- Utu (Māori concept), a Māori word referring to a ritualised revenge or payback to restore balance
- Utu (gunboat), an Estonian gunboat during World War II
- The United Transportation Union
- Untriunium, a hypothetical chemical element
- Utu, Estonia, village in Käina Parish, Hiiu County, Estonia
- Fibera KK-1e Utu, glider
- Fainu'ulelei S. Utu (1924-1974), American Samoan politician