Mictlāntēcutli or Mictlantecuhtli, in Aztec mythology, is a god of the dead and the king of Mictlan (Chicunauhmictlan), the lowest and northernmost section of the underworld. He is one of the principal gods of the Aztecs and is the most prominent of several gods and goddesses of death and the underworld. The worship of Mictlantecuhtli sometimes involved ritual cannibalism, with human flesh being consumed in and around the temple. Other names given to Mictlantecuhtli include Ixpuztec, Nextepehua, and Tzontemoc.

Aztec mythology is the body or collection of myths of the Aztec civilization of Central Mexico. The Aztecs were Nahuatl-speaking groups living in central Mexico and much of their mythology is similar to that of other Mesoamerican cultures. According to legend, the various groups who were to become the Aztecs arrived from the north into the Anahuac valley around Lake Texcoco. The location of this valley and lake of destination is clear – it is the heart of modern Mexico City – but little can be known with certainty about the origin of the Aztec. There are different accounts of their origin. In the myth the ancestors of the Mexica/Aztec came from a place in the north called Aztlan, the last of seven nahuatlacas to make the journey southward, hence their name "Azteca." Other accounts cite their origin in Chicomoztoc, "the place of the seven caves", or at Tamoanchan.