Sentinel Island may refer to:
Sentinel Island (Tasmania), Australia Sentinel Island (Colorado), United States Sentinel Island (Alaska), location of the Sentinel Island Light lighthouse Sentinel Island (Washington), one of the San Juan Islands, U.S. North Sentinel Island, part of the Andaman Islands, India, and home to the isolated Sentinelese South Sentinel Island, part of the Andaman Islands, India
See also Sentinel (disambiguation) Sentinelese (disambiguation)