Ensi may refer to:
Title
Ensign (rank), (as an abbreviation of) Ensí, a Mesopotamian royal title in various Babylonian city states
Entities
Ensi (rapper), an Italian rapper Ensi, Iran, a village in West Azerbaijan Province, Iran ensî, (plural) the Old High German word for pagan deities
Organizations
Evolution and the Nature of Science Institutes (ENSI), Indiana University program to help high school biology teachers cope with the problems associated with teaching evolution Eidgenössisches Nuklearsicherheitsinspektorat (ENSI), the Swiss Federal Nuclear Safety Inspectorate