CWC
- CWC mode
- Cabot Watch Company
- California Writers Club
- Camsur Watersports Complex
- Capitol Wrestling Corporation
- Cardigan Welsh Corgi
- Central Warehousing Corporation
- Central Wyoming College
- Ceylon Workers' Congress
- Chellammal Women's College
- Chemical Weapons Convention
- Chernivtsi International Airport
- Chess World Cup
- City of Westminster College
- Clongowes Wood College
- Clyde Workers' Committee
- Collegiate World Championship
- Colorado Women's College
- Columbia Water Center
- Concerned for Working Children
- Congress Working Committee
- Corded Ware culture
- Cricket World Cup
- Crime Writers of Canada
- CrimethInc.
- Cruiserweight Classic
- Cuyamaca Water Company
- FIFA Club World Cup
- Kickapoo Downtown Airport
- Köppen climate classification
- Stanley Park Ecology Society
- UEFA Cup Winners' Cup