The nature of God in monotheistic religions is a broad topic in Western philosophy of religion and theology, with a very old and distinguished history; it was one of the central topics in medieval philosophy.

The Abrahamic faiths, Judaism, Christianity, and Islam, all affirm monotheism, or belief in one God. These religions each give different answers as to the details, and those details are very important to the adherents of these religions; but together they share a tradition of asking the same or similar questions, and proposing the same or similar answers, about what, precisely, God is or is supposed to be.