Oswald Wirth (1860, Brienz – 1943) was a Swiss occultist, artist and author. He studied esotericism and symbolism with Stanislaus de Guaita, and in 1889 he created a set of Tarot trumps based on the Marseilles deck. His interests also included Freemasonry and astrology.
Wirth is the artist responsible for the so-called Baphomet or Leviathan design of a goat head inside a pentagram that was modified for use as the logo for Anton LaVey's Church of Satan. Wirth was not a Satanist; LaVey appropriated the illustration from a French encyclopedia of occultism by Maurice Bessey that reprinted Wirth's drawing as an interior illustration and also used it as a stamped device on the cover.