In Aztec mythology, Chalchiuhtotolin (Nahuatl for "Jade Turkey") was a god of disease and plague. He may be an aspect or alias of Tezcatlipoca.
In the Aztec calendar, Chalchiuhtotolin is the lord of the thirteen days from 1 Water to 13 Crocodile. The preceding thirteen days are ruled over by Xolotl, and the following thirteen by Chantico.