The initialism CHI may refer to:
Health
- Catholic Health Initiatives, a hospital network in the United States
- Child Health International, UK-based charity
- Children's Health Ireland, governs paediatric hospitals in Ireland
- Commission for Health Improvement, former UK body
- Community Health Index, Scotland
- Comprehensive health insurance
- Creatinine height ratio, estimating protein in body composition
Places & Sports Teams
- An abbreviation for the U.S. city of Chicago, Illinois and its major professional sports teams
- Chicago Bears of the National Football League
- Chicago Blackhawks of the National Hockey League
- Chicago Bulls of the National Basketball Association
- Chicago Cubs, also CHC, of Major League Baseball
- Chicago Fire of Major League Soccer
- Chicago White Sox, also CWS, of Major League Baseball
- Chile (in sports: IOC and FIFA code CHI)
- Channel Islands, a UK dependency (Chapman code: CHI)
Science and technology
- Carvill Hurricane Index
- Computer–human interaction or human–computer interaction
- CHI (conference)
- CHI (compiler), an Intel C compiler for heterogeneous integration
- Calinski–Harabasz index, a metric for evaluating clustering algorithms
- Hyperbolic cosine integral, in trigonometry
Transit
- Chingford railway station, United Kingdom — railway station code
- IATA code for all Chicago airports
- Chicago Union Station (Amtrak code)
- Chiltern railway station, Australia
Other
- Chichester and Harbour Independents, a minor British political party (Chichester, England)
- Columbia Helicopters, an American aircraft manufacturer
- CHI, one of Longwood University § Secret societies (Virginia, USA)
- Cationic Hydration Interlink, a hair-care brand owned by Farouk Systems (founded by Farouk Shami).
See also
- Chi (disambiguation)
- Chic (disambiguation)
- Chik (disambiguation)