^{(Also Chaac, Chaahk)}

Chaak is the primary rain God of the lowland Maya. Like His Aztec counterpart Tlaloc, Chaak's cult is ancient and is attested to at least the Olmec period, and likely earlier. He and Tlaloc share a common origin before they branched off into separate Deities in the rain god-complex.

Because Chaak is a Deity of the Maya, His cultus actually pre-dates the Aztec Tlaloc by hundreds of years.