Achorion is an obsolete genus of dermatophyte fungus.

The species previously belonging to genus Achorion have been moved to other genera. Some notable species include:

• A. quinckeanum — now named Trichophyton quinckeanum, the species which causes favus in mice.
• A. schoenleinii — now named Trichophyton schoenleinii, or "Schönlein's tricophyton", the species which causes favus in humans.
• Other pathogenic fungi occasionally found in humans:
  • A. arloingi, now called Aleurisma arloingi
  • A. gypseum, now called Microsporum gypseum

• American Illustrated Medical Dictionary (Philadelphia and London, 1938)