The Bibliotheca Philosophica Hermetica (BPH) is a private library located in the heart of Amsterdam. The library was founded by Amsterdam businessman Joost R. Ritman, who decided to make his collections part of the public domain in 1984. The library is not linked to any other public institution or library. The BPH with its collections of books and manuscripts and exhibition room is located on Bloemstraat 13-19, Amsterdam, and is freely accessible to the public.