Western rattlesnake may refer to:
* ''
Crotalus oreganus'', a venomous pitviper species found in North America in the western United States, parts of British Columbia and northwestern Mexico
* ''
Crotalus viridis'', a.k.a. the prairie rattlesnake, a venomous pitviper species native to the western United States, southern Alberta, Canada, and northern Mexico
{{SIA, snakes