| Acronym | Definition |
|---|
| CSU | Channel Service Unit |
| CSU | California State University |
| CSU | Colorado State University |
| CSU | Chicago State University |
| CSU | Columbus State University (Georgia) |
| CSU | Charleston Southern University (Charleston, SC) |
| CSU | Cleveland State University |
| CSU | Charles Sturt University (New South Wales, Australia) |
| CSU | Connecticut State University |
| CSU | Christlich-Soziale Union (German: Christian Social Party) |
| CSU | Colorado Springs Utilities |
| CSU | Columbia Southern University |
| CSU | Central State University (Ohio) |
| CSU | Clayton State University (Morrow, GA) |
| CSU | Customer Service Unit |
| CSU | Crisis Stabilization Unit |
| CSU | Crime Scene Unit |
| CSU | Careers Services Unit |
| CSU | Computer Software Unit |
| CSU | Crime Suppression Unit |
| CSU | Cagayan State University (Philippines) |
| CSU | Cardiac Surgery Unit |
| CSU | Customer Setup |
| CSU | Civil Service Union (obsolete) |
| CSU | Chinese Student Union |
| CSU | Circuit Switching Unit |
| CSU | Chester Students' Union (Chester, UK) |
| CSU | Child Support Unit |
| CSU | Catheter Specimen of Urine |
| CSU | Coûts Salariaux Unitaires (French: Unit Wage Cost) |
| CSU | Casualty Staging Unit (US DoD) |
| CSU | Casein Solubilization Units |
| CSU | Communications Switching Unit |
| CSU | Cost Schedule Update (construction projects) |
| CSU | Channel Sharing Unit |
| CSU | Capilano College Student Union |
| CSU | Crime Statistics Unit (Tennessee) |
| CSU | California South University |
| CSU | Control Status Unit |
| CSU | Channel Sending Unit |
| CSU | Conventional Signals Upgrade |
| CSU | Concentration Sending Unit |
| CSU | Central Switch Unit |
| CSU | Compact Sonar for U-Boats (Submarines) (German) |
| CSU | Control Synchronization Unit |
| CSU | Commissioning and Startup plan |
| CSU | Clinical Specialties Unit (Duke University Hospital) |
| CSU | Containerized Shower Unit |
| CSU | Crew Station Unit (US DoD) |
| CSU | Conventional Single-User (receiver type) |
| CSU | Christlich-Soziale Union in Bayern eV (German: Christian Social Union of Bavaria; political party; Germany) |
| CSU | Condensate Stabilization Unit (engineering) |
| CSU | Ceiling-Suspended Unit (air conditioning) |
| CSU | Center for Spiritual Unfolding |
| CSU | Centre Sportif Universitaire (French: University Sports Center) |
| CSU | Community Services Unit (various organizations) |
| CSU | Cultures et Sociétés Urbaines (French: Urban Cultures and Societies) |