CWS may refer to:

Environment

• Canadian Wildlife Service, part of Environment and Climate Change Canada
• Currumbin Wildlife Sanctuary, Queensland, Australia
• County Wildlife Site, local reserve status

Baseball

• Chicago White Sox, a Major League Baseball team
• College World Series, the eight-team final phase of the annual NCAA Division I baseball tournament
• Caribbean World Series, a yearly tournament

Cooperatives

• Church World Service, a cooperative humanitarian ministry
• The Co-operative Group, formerly Co-operative Wholesale Society, a consumer co-operative in the United Kingdom
• Co-operative wholesale society, a form of co-operative federation

Technology

• Centralne Warsztaty Samochodowe, a Polish pre-war automobile manufacturer
  • CWS T-1, the first serially built car manufactured in Poland
• Control Wheel Steering, an autopilot mode where the pilot controls the autopilot through the yoke
• CoolWebSearch, spyware

Military

• Chemical Warfare Service, a U.S. Army service branch, later known as Chemical Corps
• Commander's Weapon Station, the aiming and firing system for the Commander's machine gun on the M1 Abrams tank

Other

• Calfrac Well Services, an oilfield servicing company
• Celebrity worship syndrome, an obsessive-addictive disorder in which a person becomes overly involved with the details of a celebrity's personal life
• Christian Worship: Supplement, a hymnal used by the WELS
• Chronic wasting disease, a transmissible disease affecting deer and other cervid animals
• Compressed work schedule, a term for the four-day workweek