| Acronym | Definition |
|---|
| CSSU➣Combat Service Support Unit (US DoD) |
| CSSU➣Chittenden South Supervisory Union (Shelburne, VT) |
| CSSU➣Crime Scene Search Unit (various locations) |
| CSSU➣Computer Science Student Union |
| CSSU➣Cascading Style Sheets University |
| CSSU➣Christadelphian Sunday School Union (publications and teacher resources) |
| CSSU➣Centro Studi Scenari Urbani (Italian: Center for Studies on Urban Terrain; Lumsa University; Rome, Italy) |
| CSSU➣Central Sterile Supply Unit (various organizations) |