Rattlesnake Island may refer to:
Rattlesnake Island (Clear Lake), in Lake County, California A previous name for Terminal Island, in Los Angeles County, California Rattlesnake Island (Lake Erie), in Ohio Rattlesnake Island (New Hampshire), in Lake Winnipesaukee Rattlesnake Island (Okanagan Lake), in British Columbia Rattlesnake Island (Queensland), in Halifax Bay, used for bombing practice