CASI or Casi may refer to:
Acronyms Canadian Aeronautics and Space Institute Canadian Association of Snowboard Instructors China Aerospace Studies Institute, a research institute of the United States Department of the Air Force Center for the Advanced Study of India, at the University of Pennsylvania, US Club Atlético San Isidro, a sports club in San Isidro, Argentina Cognitive Abilities Screening Instrument Computer-assisted self interviewing Continental Air Services, Inc, an airline
Other uses "Casi" (song), a 2003 song by Soraya Calcium monosilicide Chashi or casi, hilltop forts of the Ainu Casi (given name)