| Acronym | Definition |
|---|
| CASU➣Casualty |
| CASU➣Conseiller d'Administration Scolaire et Universitaire (French: School and University Administration Advisor) |
| CASU➣Cooperative Administrative Support Unit (GSA) |
| CASU➣Carrier Aircraft Service Unit (USN) |
| CASU➣Cambridge Astronomical Survey Unit (UK) |
| CASU➣Combat Aircraft Service Unit (US DoD) |
| CASU➣Client Advisory Services Unit (Oregon Health Plan) |
| CASU➣Centrale d'Appels Sanitaires Urgents (Geneva, Switzerland medical emergencies call center) |
| CASU➣College of Arts Student Union (University of Guelph, Ontario, Canada) |