Gordon Haddon Clark was an American philosopher and Calvinist theologian. He was a primary advocate for the idea of presuppositional apologetics and was chairman of the Philosophy Department at Butler University for 28 years. He was an expert in pre-Socratic and ancient philosophy and was noted for his rigor in defending propositional revelation against all forms of empiricism and rationalism, in arguing that all truth is propositional and in applying the laws of logic. His system of philosophy is sometimes called Scripturalism.
The Trinty Foundation continues to publish his writings.