| Acronym | Definition |
|---|
| CSIU➣Central Susquehanna Intermediate Unit (Pennsylvania) |
| CSIU➣Corrective Services Investigation Unit (Queensland, Australia) |
| CSIU➣Core Segment Interface Unit (NASA) |
| CSIU➣Crime Scene Investigation Unit |
| CSIU➣Customer Satisfaction Information Usage |
| CSIU➣Combat System Interface Unit |