CIWS
| Acronym | Definition |
|---|---|
| CIWS | Close-In Weapon System (US Navy) |
| CIWS | Canadian Injured Workers Society |
| CIWS | Center for Integrated Watershed Studies (Binghamton University) |
| CIWS | Community Information and Warning System (Australia) |
| CIWS | Children's International Wildlife Sanctuary (Saratoga, NY) |
| CIWS | Compliance Information Web Submission (EPA) |
| CIWS | Chelan Interagency Weather System (Wenatchee, WA) |