Our title contains already a thesis : it is absolutely imaginable, that the figure of the philosopher Baruch Spinoza be amongst other also a symbol for Friedrich Nietzsche’s Zarathustra. In possession of the certainly valid documents and knowledges of Nietzsche’s investigation, we cannot yet quite clearly answer the question explicitly put in the title. If a positive reply to this question were today already possible, it would be from the beginning a philological-philosophical sensation. It would namely be a new key to the philosophical poetry Zarathustra so difficult to interpret, it would thus however be – i.e. through the concrete identification of the protagonists of the philosophical poem with Spinoza – also a further and rarely effective key also to Friedrich Nietzsche’s whole work.