Theatrum Chemicum

Theatrum Chemicum ("Chemical Theatre"), is a compendium of early alchemical writings published in six volumes over the course of six decades. The first three volumes were published in 1602, while the final sixth volume was published in its entirety in 1661. Theatrum Chemicum remains the most comprehensive collective work on the subject of alchemy ever published in the Western world.

The full title of the work is Theatrum Chemicum, præcipuos selectorum auctorum tractatus de Chemiæ et Lapidis Philosophici Antiquitate, veritate, jure præstantia, et operationibus continens in gratiam veræ Chemiæ et Medicinæ Chemicæ Studiosorum (ut qui uberrimam unde optimorum remediorum messem facere poterunt) congestum et in quatuor partes seu volumina digestum, though later volumes express slightly modified titles. For the sake of brevity, the work is most often referred to simply as Theatrum Chemicum.

All volumes of the work, with exception of the last two volumes, were published by Lazarus Zetzner in Oberursel and Strasbourg, France. The final two volumes were published posthumously by Zetzner's heirs, who continued to use his name for publication purposes.

The volumes are in actuality a collection of previously published and unpublished alchemical treatises, essays, poems, notes, and writings from various sources, some of which are attributed to known writers and others remain anonymous. Despite Zetzner acting primarily as publisher and editor, many of the contents are not believed to have been written by him. However, because the Theatrum Chemicum was more widely disseminated in comparison to most alchemical texts of the era, and its text was in the universal Latin used by most scholars of the time, Zetzner is often cited as the author of many early alchemical texts which he in fact did not compose.