| Abbreviation | Definition |
|---|---|
| IRCTC | Indian Railway Catering and Tourism Corporation (Ltd.) |
| IRE | Ireland |
| IRI | Islamic Republic Of Iran |
| IRL | Ireland |
| IRN | Iran |
| IRON | International Rice Observational Nursery |
| IRP | Islamic Republic of Pakistan |
| IS | Iceland |
| ISL | Israel |
| ISO | Imamia Students Organization |
| IT | Italy |
| JA | Jamaica |
| JAP | Japanese |
| JM | Jamaica |
| JO | Jordan |
| JP | Japan |
| KASOS | King Albert Salutes Older Soldiers |
| KE | Kenya |
| KEN | Kenya |
| KG | Kyrgyz Republic (Kyrgyzstan) |