Oswald Wirth (1860 – 1943) was a Swiss occultist, Kabbalist, and Freemason. The author of many books of esoterica, he is most well-known for publishing, in 1889, a version of the Marseille Tarot known as the Wirth/de Guaita, initiating an era of reimagined tarot decks that continues in the present day.