| KSI | Kent Sussex Industries 
| Others |
| KSI | Kentucky System of Intervention
| Others |
| KSI | Key Set Identifier
| Others |
| KSI | Key Source International
| Others |
| KSI | Key Strategic Initiative
| Others |
| KSI | Key Strategic Initiatives
| Others |
| KSI | Key Stroke Interface
| Others |
| KSI | Key Success Indicator
| Others |
| KSI | Keyless Signature Infrastructure
| Others |
| KSI | Kia Satisfaction Index
| Others |
| KSI | Kia Service Index
| Others |
| KSI | KidSave International
| Others |
| KSI | Killed or Seriously
| Others |
| KSI | Kilopounds per Square Inch
| Others |
| KSI | Kinetic Solutions Incorporated
| Others |
| KSI | King Slayer Imp
| Others |
| KSI | Kingdom of the Seraphine Isles
| Others |
| KSI | Kitchen Suppliers Inc
| Others |
| KSI | Knowledge Sector Initiative
| Others |
| KSI | Knowledge Strength Integrity
| Others |
| KSI | Knowledge Support and Integrity
| Others |
| KSI | Knowledge Systems Institute
| Others |
| KSI | Knowledge, Strength, Integrity
| Others |
| KSI | Kong Skull Island
| Others |
| KSI | Korean Studies Institute
| Others |
| KSI | Korey Stringer Institute
| Others |
| KSI | Krackeler Scientific, Inc.
| Others |
| KSI | Kraemer Sonic Industries
| Others |
| KSI | KSI Should Igo
| Others |
| KSI | Supply Inc
| Others |