| CSU | Cagayan State University 
| Others |
| CSU | California Snowflake University
| Others |
| CSU | California State University
| Others |
| CSU | California State University's
| Others |
| CSU | Calipornia State University
| Others |
| CSU | Call-it-fun State University
| Others |
| CSU | Call-it-phoney State University
| Others |
| CSU | Camp Suicide University
| Others |
| CSU | Cardiac Surveillance Unit
| Others |
| CSU | Carlisle Skater Union
| Others |
| CSU | Carolina Salt University
| Others |
| CSU | Castro State-run University
| Others |
| CSU | Casualty Staging Unit
| Others |
| CSU | Catheter Specimen of Urine
| Others |
| CSU | Cauliflower State University
| Others |
| CSU | CDAS and SOCC Upgrade
| Others |
| CSU | Central South University
| Others |
| CSU | Central State University
| Others |
| CSU | Central Statistical Unit
| Others |
| CSU | Central Support Unit
| Others |
| CSU | Central Switching Unit
| Others |
| CSU | Channel Service Unit
| Others |
| CSU | Charles Sturt University
| Others |
| CSU | Charleston Southern University
| Others |
| CSU | Chevrolet Suburban
| Others |
| CSU | Chicago State University
| Others |
| CSU | Christian Service University College
| Others |
| CSU | Christian Social Union
| Others |
| CSU | Christian Student Union
| Others |
| CSU | Christlich Soziale Union
| Others |
| CSU | Christlich-Soziale Union
| Others |
| CSU | Christlich-Soziale Union (Christian Social Union (of Bavaria))
| Others |
| CSU | Chulavista State University
| Others |
| CSU | Citizen Service Unit
| Others |
| CSU | Clarks Summit University
| Others |
| CSU | Clayton State University
| Others |
| CSU | Cleveland State University
| Others |
| CSU | Clinical Service Unit
| Others |
| CSU | Clinical Specialty Unit
| Others |
| CSU | College School Unit
| Others |
| CSU | Coloradical Soviet University
| Others |
| CSU | Colorado Soviet University
| Others |
| CSU | Colorado Spam University
| Others |
| CSU | Colorado Springs Utilities
| Others |
| CSU | Colorado State University
| Others |
| CSU | Colorectal State University Fort Collins
| Others |
| CSU | Colorectal State University Los Angleles
| Others |
| CSU | Coloredfoam State University
| Others |
| CSU | Columbia Southern University
| Others |
| CSU | Columbus State University
| Others |
| CSU | Commiefornia State University
| Others |
| CSU | Commierado Soviet University
| Others |
| CSU | Commissioning and StartUp
| Others |
| CSU | Commissioning Support Unit
| Others |
| CSU | Community Safety Unit
| Others |
| CSU | Community Services Unlimited
| Others |
| CSU | Commuter School University
| Others |
| CSU | Compact Suv
| Others |
| CSU | Complete Set of Unifiers
| Others |
| CSU | Computer Software Unit
| Others |
| CSU | Connecticut State University
| Others |
| CSU | Consejo Superior Universitario
| Others |
| CSU | Control Service Units
| Others |
| CSU | Coppin State University
| Others |
| CSU | Crank Angle Selecting Unit
| Others |
| CSU | Crappy Socialist University
| Others |
| CSU | Crime Scene Unit
| Others |
| CSU | Crime Screening Unit
| Others |
| CSU | Crime Solving Unit
| Others |
| CSU | Crisis Stabilization Unit
| Others |
| CSU | Crown Steerer Upper
| Others |
| CSU | Cumulative Security Update
| Others |
| CSU | Customer Service Unit
| Others |
| CSU | Customer Set Up
| Others |
| CSU | Cyber Security Research Unit
| Others |