Founded in 1929, Westminster Theological Seminary is a Presbyterian and Reformed Christian graduate institution that offers theological education at Philadelphia campus and through a program of study in London. In 1982, the California campus of Westminster became an independent institution which is now known as Westminster Theological Seminary California.

Westminster Theological School exists to form Christian leaders to proclaim the whole counsel of God throughout a changing world. The Seminary is committed to Scripture and to the systematic exposition of biblical truth known as the Reformed faith. The School also subscribes to the Westminster Confession of Faith. Westminster desires to be used in training ministers of the gospel and others for service in those churches committed to the Three Forms of Unity as subordinate standards.

The current president of Westminster Theological Seminary Dr. Peter A. Lillback. He is also the Professor of Historical Theology.