CWS may refer to:
In environment:
- Canadian Wildlife Service, also known as Environment Canada
- Currumbin Wildlife Sanctuary, Queensland, Australia
- County Wildlife Site, local reserve status
In baseball:
- Chicago White Sox, Major League Baseball team
- College World Series, college baseball tournament conducted by the NCAA
- Caribbean World Series, yearly tournament between top winter teams from Puerto Rico, Mexico, Dominican Republic and Venezuela
In misc. technology and companies:
- Calfrac Well Services, oilfield servicing company
- Celebrity Worship Syndrome
- Control Wheel Steering, special autopilot function in aeroplanes
- CoolWebSearch, spyware
- CWS T-1, the first serially built car manufactured in Poland
Other:
- Church World Service, cooperative humanitarian ministry
- Co-operative Group, large consumers' co-operative
- Co-operative wholesale society