Philosophy of religion is a branch of philosophy concerned with questions regarding religion, including the nature and existence of God, the examination of religious experience, analysis of religious vocabulary and texts, and the relationship of religion and science. It is an ancient discipline, being found in the earliest known manuscripts concerning philosophy, and relates to many other branches of philosophy and general thought, including metaphysics, logic, and history. Philosophy of religion is frequently discussed outside of academia through popular books and debates, mostly regarding the existence of God and problem of evil.

The philosophy of religion differs from religious philosophy in that it seeks to discuss questions regarding the nature of religion as a whole, rather than examining the problems brought forth by a particular belief system. It is designed such that it can be carried out dispassionately by those who identify as believers or non-believers.