Châtel-Guyon (French: [ʃɑtɛl ɡɥijɔ̃]; Auvergnat: Chastel Guion) is a commune in the Puy-de-Dôme department in Auvergne-Rhône-Alpes in central France.

Prior to June 2008 it was officially known as Châtelguyon,[5] the change in the official styling being an adoption of its colloquial spelling, as, for example, used by Guy de Maupassant in his 1884 short story, "Le tic".

[6] At the time of the First World War, the population was approximately 2000 residents.

[7] It was an international destination for its baths and healing springs and attracted 30,000 visitors each summer.

[8] The American Expeditionary Force established Base Hospital No.