| Abbreviation | Definition |
|---|---|
| CSG | Cavalry Security Group |
| CSG | Chris Sawyer Graphics |
| CSG | Commercial Services Group |
| CSG | Conservation Services Group |
| CSG | Consulting Services Group |
| CSG | Control Systems Group |
| CSGI | Clean Sweep Group Inc |
| CSI | Cadsoft Solutions, Inc. |
| CSI | Campbell Scientific, Inc. |
| CSI | Car Systems Installation |
| CSI | Cardiovascular Systems Inc |
| CSI | Caregiver Services Inc |
| CSI | Cartwise Systems, Inc. |
| CSI | Closure Systems International |
| CSI | Collateral Services Incorporated |
| CSI | Colorado Structures Inc |
| CSI | Colorado Swimming Inc |
| CSI | Commodity Systems Inc |
| CSI | Community Solutions Inc |
| CSI | Computer Security International |