Crotalus stephensi is a venomous pitviper species found in central and southern Nevada and adjacent California. Common names include Panamint rattlesnake, Panamint rattler, Owens Valley Rattler, and Tiger rattlesnake (not to be confused with C. tigris).

The color pattern consists of a straw, tan, buff, brown, or gray ground color, overlaid with a series of buff, gray, brown, or deep red-brown blotches. Often, gray suffusions occur on the sides of the body and head, and a scattering of black-tipped scales occur on the back, especially at the edges of the blotches.

C. stephensi is found in desert-mountain areas of the eastern slopes of the Sierra Nevada from Mono County, California, east to Nye County, Nevada, south through southwestern Nevada, southeast to Clark County, Nevada, and southwest to central San Bernardino County, California at 900 to 2,400 m (3,000 to 7,900 ft) altitude.