Crotalus tlaloci is a species of rattlesnake from Mexico. The species is named after Tláloc, the Aztec god of rain. As with all rattlesnakes, it is venomous.
Crotalus tlaloci can be distinguished from similar species of snakes, such as C. triseriatus, by specific scale counts, a proportionately smaller rattle, and a proportionally longer tail. It can also be told apart by a dark narrowing marking near its eye.
Crotalus tlaloci is known to inhabit open areas in cloud forests and humid oak-pine forests. Usually it inhabits areas with broad-leaf oaks and dense undergrowth.