Quetzalcoatl (/ ˌkɛtsəlkoʊˈætəl / ) [pron 1] (Nahuatl: "Feathered Serpent") is a deity in Aztec culture and literature. Among the Aztecs, he was related to wind, Venus, Sun, merchants, arts, crafts, knowledge, and learning. He was also the patron god of the Aztec priesthood.

In the 17th century, Ixtlilxóchitl, a descendant of Aztec royalty and historian of the Nahua people, wrote, "Quetzalcoatl, in its literal sense, means 'serpent of precious feathers' but in the allegorical sense, 'wisest of men'." In Mesoamerican history, many different ethnopolitical groups worshiped a feathered-serpent deity.

Animals thought to represent Quetzalcoatl include resplendent quetzals, rattlesnakes (coatl meaning "serpent" in Nahuatl), crows, and macaws. In his form as Ehecatl he is the wind, and is represented by spider monkeys, ducks, and the wind itself. In his form as the morning star, Venus, he is also depicted as a harpy eagle.

According to such sixteenth century Spanish authorities as Fray Bernardino de Sahagun, [...] the title of Quetzalcoatl was reserved for the high priests or pontiffs among the Aztecs and other inhabitants of Mexico. Only they were entitled to wear the emblem of ehēcacōzcatl, the insignia of this god.