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is a township in Bradford County, Pennsylvania, United States. The population was 1,340 at the 2000 census.
According to the United States Census Bureau, the township has a total area of 19.5 square miles (50.4 km²), of which, 19.0 square miles (49.1 km²) of it is land and 0.5 square miles (1.3 km²) of it (2.57%) is water.
Ulster Township is bordered by Athens Township to the north. Sheshequin Township lies across the Susquehanna River to the east. Ulster Township is bordered by North Towanda Township to the southeast, Burlington Township to the south and west and Smithfield Township to the west.