Thus Spoke Zarathustra: A Book for All and None (German: Also sprach Zarathustra: Ein Buch fur Alle und Keinen), also translated as Thus Spake Zarathustra, is a work of philosophical fiction written by German philosopher Friedrich Nietzsche between 1883 and 1885. The protagonist is nominally the historical Zoroaster, but, besides a handful of sentences, Nietzsche is not concerned with a specific resemblance. Much of the book purports to be what Zarathustra said, and it repeats the refrain, "Thus spoke Zarathustra."

The style of Zarathustra has facilitated variegated and often incompatible ideas about what Zarathustra says. Zarathustra's "[e]xplanations and claims are almost always analogical and figurative."[1] Though there is no consensus with what Zarathustra means when he speaks, there is some consensus about that which he speaks. Zarathustra deals with ideas about the Ubermensch, the death of God, the will to power, and eternal recurrence.

Zarathustra himself first appeared in Nietzsche's earlier book The Gay Science. Nietzsche has suggested that his Zarathustra is a tragedy and a parody and a polemic and the culmination of the German language. It was his favorite of his own books. He was aware, however, that readers might not understand it. This is possibly why he subtitled it A Book for All and None. However, as with the content as a whole, the subtitle has baffled many critics, and there is no consensus.

Zarathustra's themes and merits are continually disputed. It has nonetheless been hugely influential in various facets of culture.

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