The Quinque viæ are five logical arguments for the existence of God summarized by the 13th-century Catholic philosopher and theologian Thomas Aquinas in his book Summa Theologica. They are:the argument from "first mover"; the argument from universal causation; the argument from contingency; the argument from degree; the argument from final cause or ends.

The existence of God is a subject of debate in theology and the philosophy of religion. A wide variety of arguments for and against the existence of God can be categorized as logical, empirical, metaphysical, subjective or scientific. In philosophical terms, the question of the existence of God involves the disciplines of epistemology and ontology and the theory of value.