Uster is a city and municipality in the canton of Zürich in Switzerland.
Uster may also refer to:
- Uster Castle, in the city of Uster
- Uster Reformed Church, in the city of Uster
- Uster (district), a district in the canton of Zürich
- Uster Technologies, a company in the city of Uster
- Usteria, a plant genus in the family Loganiaceae
- Timo Uster (born 1974), a Gambian footballer