Puy is a geological term used locally in the Auvergne, France for a volcanic hill (the word deriving from the Provencal "Puech", meaning an isolated hill). Most of the puys of central France are small cinder cones, with or without associated lava, whilst others are domes of trachytic rock, like the domite of the Puy-de-Dôme. The puys may be scattered as isolated hills, or, as is more usual, clustered together, sometimes in lines.

See Poy.