Bibliotheca Philosophica Hermetica or The Ritman Library is a private Dutch library founded by Joost Ritman. The Bibliotheca Philosophica Hermetica brings together manuscripts and printed works in the field of Hermeticism, more specifically the 'Christian-Hermetic' tradition. It is located on the Bloemstraat in the center of Amsterdam.
The Bibliotheca Philosophica Hermetica was founded in 1984 by Joost Ritman and is not linked to any public organisation or library. The Bibliotheca does co-operate 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 and artistic value. Other area's of the collection are Sufism, Kabbalah, Anthroposophy, Freemasonry, Judaica and Grail. There are ca. 4,500 manuscripts and books printed before 1800, and ca. 17,000 books (primary and secondary sources) printed after 1800. Among the treasures of the Bibliotheca Philosophica Hermetica are the Corpus Hermeticum published in 1471, the first illustrated edition of Dante's La Divina Commedia from 1481, and Cicero's De Officiis printed in 1465.
The library is currently focussing on reshaping the once privately funded library into a self-sustaining and public institution, and on preparing the move to the Huis met de Hoofden (House with the Heads) in the autumn of 2015. The originally private library therefore acquired the status of a Public Benefit Institution (ANBI). With the rehousing to the Keizersgracht 123, a new era begins in which the library will be passed on to a new generation and made accessible to a broader audience.