Rattlesnake Island (Conchas Lake) (in Conchas Lake), New Mexico

Rattlesnake Island (Maryland), in Maryland

Rattlesnake Island (Queensland), in Halifax Bay, used for bombing practice

Rattlesnake Island (Lake Erie), in Ohio

Rattlesnake Island (Clear Lake), in Lake County, California

a previous name for Terminal Island, in Los Angeles County, California

Rattlesnake Island (New Hampshire), in Lake Winnipesaukee, New Hampshire

Rattlesnake Island (Florida), about 58 miles from Jacksonville, Florida

Rattlesnake Island (Okanagan Lake), in British Columbia