Tranquil, is a calm state of mind.

Tranquil' may also refer to: Tranquil (horse) (1920–1938), a British Thoroughbred racehorse Tranquil, Mississippi, a town in the United States Tranquil Lake, a lake in the South Orkney Islands

See also Tranquil Star, an Australian Thoroughbred racehorse Tranquility (disambiguation)