Douglas R. Groothuis (/ˈɡroʊtaɪs/ GROH-tysse; born January 3, 1957) is an American Christian philosopher who is a professor of philosophy at Cornerstone University.

Groothuis was a campus pastor for twelve years prior to obtaining a position as an associate professor of philosophy of religion and ethics at Denver Seminary from 1993 to 2024.

The phenomena of near-death experiences and the claims of Betty Eadie about the afterlife were the subject of his analysis in Deceived by the Light.

His interests in philosophy have also led him to write on topics like Immanuel Kant's epistemology, the rationality of theism, and book-length treatments of the philosophical ideas and methods of Blaise Pascal and Jesus.

Articles have appeared in periodicals such as Christianity Today, the Journal of the Evangelical Theological Society, Philosophia Christi, and Moody Monthly.