"God is dead" (German: Gott ist tot [ɡɔt ɪst toːt] ; also known as the death of God) is a statement made by the German philosopher Friedrich Nietzsche. The first instance of this statement in Nietzsche's writings is in his 1882 The Gay Science, where it appears three times. The phrase also appears at the beginning of Nietzsche's Thus Spoke Zarathustra.
The meaning of this statement is that since, as Nietzsche says, "the belief in the Christian God has become unbelievable", everything that was "built upon this faith, propped up by it, grown into it", including "the whole [...] European morality", is bound to "collapse". The time of the Enlightenment had transformed collective human knowledge to the point where many would question their beliefs. The framing of the construct suggests that God could exist, from an atheistic perspective, in the minds of men rather than in reality, and so widespread disbelief would equate to God's death.
Other philosophers had previously discussed the concept, including Philipp Mainländer and Georg Wilhelm Friedrich Hegel. The phrase is also discussed in the Death of God theology.