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.

[2] He then began graduate study at Princeton University, but, after being awarded a Rhodes Scholarship, matriculated to St John's College, Oxford, instead.

Shortly thereafter he enrolled at Yale University Graduate School to study for a PhD in philosophy, which was awarded in 1965.

[2] In 1967, Princeton Theological Seminary offered him the position of associate professor of philosophy, which, he accepted.

[2] By the time of his retirement in 2002, he had served the faculty for thirty-five years and had become an authority on Gottfried Leibniz and an influential interpreter of Simone Weil and Søren Kierkegaard.