Chac: Dios de la lluvia, also released as Chac: the Rain God and simply Chac, is a 1975 film written and directed by Rolando Klein.

The film involves modern Maya peoples invoking the traditional rain deity Chaac.

The film is in the Maya languages. The majority of the cast speaks Tzeltal Maya, but one of the main actors, Pablo Canche Balam who plays the shaman, speaks Yucatec Maya.

Alonso Méndez Ton, who plays the cacique, was born in the city of Tenejapa, in the state of Chiapas, where he collaborated in ethnographic research. He had finished his term as mayor of Tenejapa when the movie was made.

The film is referenced in Richard Kadrey's novel Aloha From Hell where it is called Las montañas del Gehenna (a title that appears nowhere else). The narrator's plot description is basically accurate though he does incorrectly call it a "Mexican spaghetti western".