Bibliotheca Philosophica Hermetica (BPH) or The Ritman Library is a Dutch library founded by Joost Ritman located in the Huis met de Hoofden (House with the Heads) at Keizersgracht 123, in the center of Amsterdam. The Bibliotheca Philosophica Hermetica brings together manuscripts and printed works in the field of Hermeticism, more specifically what it likes to call the 'Christian-Hermetic tradition'.

The Embassy of the Free Mind is a museum, library, and intellectual platform inspired by the collection.

The library

The Bibliotheca Philosophica Hermetica was founded in 1957 by Joost R. Ritman and opened to the public in 1984. The library is now supported by a foundation and is a public institution. The Bibliotheca co-operates with international libraries and organizations, such as the Russian Rudomino Library for Foreign Literature in Moscow, the Herzog August Bibliothek in Wolfenbüttel, the Biblioteca Medicea Laurenziana in Florence, and the Biblioteca Marciana in Venice.

To date, the library holds more than 23,000 volumes on hermetica, Rosicrucianism, alchemy, mysticism, gnosis, esotericism and comparative religion, and has great scientific, artistic, and cultural value. Other areas of the collection are Sufism, Kabbalah, anthroposophy, theosophy, pansophy, Freemasonry, and the Grail. The entire Bibliotheca Philosophica Hermetica collection consists of around 28,000 books, including around 7,500 books printed before 1800, 70 incunables, 700 post-1550 manuscripts, and 25 manuscripts written before 1550. The remaining books are post 1800.