The Mojave Desert Sidewinder (Crotalus cerastes), also known as the Horned Rattlesnake and Sidewinder Rattlesnake, is a venomous pit viper species belonging to the genus Crotalus (rattlesnakes) and is found in the desert regions of the southwestern United States and northwestern Mexico. 

It is sometimes referred to as the Horned Rattlesnake because of the raised supra-ocular scales above its eyes. This adaptation may help shade the eyes or prevent sand drifting over them as the snake lies almost buried in it. he color pattern consists of a ground color that may be cream, buff, yellowish-brown, pink, or ash gray, overlaid with 28-47 dorsal blotches sub-rhombic or sub-elliptical in shape.

In the United States in the desert areas from northeastern Los Angeles County and San Bernardino County, California, northward to southern Mono County, California, east across Nevada to Washington County, Utah, and south through Mohave County, Arizona in desert lowlands at elevations between 152 and 1,829 meters.