| Acronym | Definition |
|---|
| KSI | Key Source International |
| KSI | Key Set Identifier |
| KSI | Killed or Seriously Injured (UK road safety statisitcs) |
| KSI | Key Solutions, Inc. (various companies) |
| KSI | Kinetic Systems, Inc. (various locations) |
| KSI | Knattspyrnusamband Íslands (football association of Iceland) |
| KSI | Kovack Securities, Inc. (Ft. Lauderdale, FL) |
| KSI | Kips Per Square Inch (engineering) |
| KSI | Thousands of pounds per Square Inch |
| KSI | Kyocera Solar, Inc. (Scottsdale, AZ) |
| KSI | Kubota Systems, Inc. (Osaka, Japan) |
| KSI | Kyoto Sustainability Initiative (Kyoto, Japan) |
| KSI | Kriya Systems, Inc. (software company) |
| KSI | Kommando Schwarze Infusion (German: Command Black Infusion) |
| KSI | Knowledge, Strength, Integrity (gaming community) |
| KSI | Kludge Sound Inc. |
| KSI | Killing Spree Inc (gaming clan) |
| KSI | Kali Sikaran International (martial arts) |
| KSI | Kelly Services Incorporated |
| KSI | Knight of the Star of India |
| KSI | Killing Service Incorporated (gaming clan) |