Greg L. Bahnsen (September 17, 1948 – December 11, 1995) was an American Calvinist philosopher, apologist, and debater. He was a minister in the Orthodox Presbyterian Church and a full-time Scholar in Residence for the Southern California Center for Christian Studies (SCCCS). He is also considered a contributor to the field of Christian apologetics, as he popularized the presuppositional method of Cornelius Van Til.[ He is the father of David L. Bahnsen, an American portfolio manager, author, and television commentator.