Pseudonymous Bosch is the pen name of Raphael Simon (born October 25, 1967), the author of The Secret Series and The Bad Books series of fiction books, as well as The Unbelievable Oliver chapter book mysteries and two stand-alone titles. He has written 12 books, each widely read.

Pseudonymous Bosch is the infamously anonymous author of the New York Times bestselling Secret Series and the Bad Books. Despite rumors to the contrary, his books are not actually written by his pet rabbit, Quiche; the rabbit is merely his typist.