Crotalus angelensis, or the Ángel de la Guarda Island speckled rattlesnake,[3] is a pit viper species[4][5] endemic to Isla Ángel de la Guarda in the Gulf of California, Mexico.

[3] Found only on Isla Ángel de la Guarda in the Gulf of California, Mexico.

[3] The type locality given is "about 4 miles [6 km] southeast of Refugio Bay, at 1,500 feet [460 m] elevation, Isla Ángel de la Guarda, Gulf of California, Mexico (near 29°29½'N, 113°33'W)".

[2][5] Gravelly beaches along the shore; rocky arroyos, washes, and on the hillsides of the island's interior, from sea-level up to 500 m.[1] This species is classified as "Least Concern" (LC) on the IUCN Red List of Threatened Species.

It occurs in a protected area and is very abundant within its small range.