Who are the gods that the Aztecs believed in?

Chalchiuhtlicue

Coatlicue

Coyolxauhqui

Huitzilopochtli

Tezcatlipoca

Tlaloc

Xiuhtecutli

In his book Los Aztecas, Hombre yTribu (Aztecs, the Man and the Tribe), Victor Wolfgang von Hagen says: "There were personal gods, each plant had its god, each function its god or goddess, even suicides had one. Yacatecuhtli was the businessmen's deity. In this polytheistic world, all the gods had clearly defined tendencies and functions."

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There were many...

Centeotl is a maize god

Chalchihuihtotolin is the Jewelled Fowl

Chalchiuhtlicue is the goddess of running waters

Chalmecatecuhtli is a god of the underworld and of sacrifice

Chantico is goddess of the hearth and terrestrial fire

Cihuateteo are the spirits of women who died in childbirth

Citlalicue is the goddess of the stars

Huehuecoyotl is the Old Coyote, the Trickster

Itzpapalotl is the Female Warrior

Itztlacoliuhqui is the god of objectivity and justice

Itztli is a god of stone and sacrifice

Mictantecuhtli is the Lord of the Underworld

Patecatl is Lord of the Land of Medicines

Piltzintecuhtli is the Youthful Lord, a solar deity

Quetzalcoatl is the Feathered Serpent or Precious Twin

Tecciztecatl is the Old Moon God

Tepeyollotl is Heart of the Mountain

Tlaloc is the Rain God

Tlaltecuhtli is the Earth God

Tonacatecuhtli is Lord of Our Sustenance

Tonatiuh is the Sun

Xipe Totec is a god of rebirth

Xiuhtecuhtli is Lord of the Year.

There are also others.

For further information see the related link.