Union Theological Seminary is a Christian seminary in New York that is affiliated with Columbia University.
Union Theological Seminary may also refer to:
- Guangdong Union Theological Seminary, a Protestant seminary in Guangzhou, Guangdong, China
- Nanjing Union Theological Seminary, a Protestant seminary in Jiangsu, China
- Tokyo Union Theological Seminary, a Protestant seminary in Japan
- Union Presbyterian Seminary or Union Theological Seminary in Virginia and Presbyterian School of Christian Education, in Richmond, Virginia, and Charlotte, North Carolina
- Union Theological Seminary (Philippines), a Protestant seminary in Dasmariñas, Cavite, Philippines