Westminster Theological Seminary (WTS) is a Protestant theological seminary in the Reformed theological tradition in Glenside, Pennsylvania. It was founded by members of the faculty of Princeton Theological Seminary in 1929 after Princeton chose to take a liberal direction during the Fundamentalist–Modernist controversy.

Glenside is a census-designated place (CDP) located in Cheltenham Township and Abington Township in Montgomery County, Pennsylvania, United States. It borders Northwest Philadelphia. The population was 7,737 at the 2020 census on a land area of 1.3 square miles.