For the fictional character from the Legends of Dune books, see Titan (Dune)#Tlaloc.

Tlaloc (Classical Nahuatl:Tlāloc[ˈtɬaːlok]) was an important deity in Aztec religion; as supreme god of the rains, he was also by extension a god of fertility and of water. He was widely worshipped as a beneficent giver of life and sustenance, but he was also feared for his ability to send hail, thunder, and lightning, and for being the lord of the powerful element of water. Tlaloc is also associated with caves, springs, and mountains, most specifically the sacred mountain in which he was believed to reside. His animal forms include herons and water-dwelling creatures such as amphibians, snails, and possibly sea creatures, particularly shellfish. The Mexican marigold, Tagetes lucida, known to the Aztecs as yauhtli, was another important symbol of the god, and was burned as a ritual incense in native religious ceremonies.