Guy de Chauliac, also called Guido or Guigo de Cauliaco, (c. 1300 – 25 July 1368), was a French physician and surgeon who wrote a lengthy and influential treatise on surgery in Latin, titled Chirurgia Magna. It was translated into many other languages (including Middle English) and widely read by physicians in late medieval Europe.
Three other works were written by Chauliac: Practica astrolabii (De astronomia), an essay on astrology; De ruptura, which describes different types of hernias; and De subtilianti diaeta, describing treatments for cataracts.