Diogenes Allen (October 17, 1932 – January 13, 2013) was an American philosopher and theologian who served as the Stuart Professor of Philosophy at Princeton Theological Seminary. He was ordained by the Episcopal Church in the United States of America and served as priest associate at All Saints' Episcopal Church, Princeton, New Jersey. He held courtesy membership as a minister in the Presbyterian Church (USA) as well. He died on January 13, 2013 in Newtown, Bucks County, Pennsylvania.