CHI
- Body composition
- CHI (compiler)
- CHI (conference)
- Calinski–Harabasz index
- Carvill Hurricane Index
- Catholic Health Initiatives
- Channel Islands
- Chi (disambiguation)
- Chic (disambiguation)
- Chicago
- Chicago Bears
- Chicago Blackhawks
- Chicago Bulls
- Chicago Cubs
- Chicago Fire FC
- Chicago Union Station
- Chicago White Sox
- Chichester and Harbour Independents
- Chik (disambiguation)
- Child Health International
- Children's Health Ireland
- Chile
- Chiltern railway station
- Chingford railway station
- Columbia Helicopters
- Commission for Health Improvement
- Community Health Index (Scotland)
- Farouk Shami
- Longwood University
- Trigonometric integral