CWI is an abbreviation for the following organizations/institutions:
- Centrum Wiskunde & Informatica, Amsterdam, The Netherlands
- College of Western Idaho, a new Community College in Nampa, Idaho
- Committee for a Workers' International, an international socialist organisation
- Communist Workers' International
- Country Women's Institute
- Christian Witness to Israel
- Care for the Wild International
- Civil War Institute at Gettysburg College
- Canadian Wrestling International, a Canadian professional wrestling promotion based in Brantford
CWI can also refer to:
- Certified Welding Inspector, a certification from the American Welding Society
- Chicago and Western Indiana Railroad
- Child Well-Being Index
- Civil War: The Initiative, a comic book crossover storyline.
- Comparable Wage Index
- Creditworthiness Index
- Cloverway Inc., a Japanese Animation dubbing company in the United States