| Abbreviation | Definition |
|---|---|
| IRAMASUKA | Irian Jaya, Maluku, Sulawesi, Kalimantan |
| IRJEN | Inspektur Jenderal |
| IRT | Ibu Rumah Tangga |
| IRTC | Indonesian RC Tank Community |
| ISAA | Indonesian Shipping Agency Association |
| ISAQ | Indonesian Student Association of QUT |
| ISBB | Indonesian Society for Bioinformatics and Biodiversity |
| ISI | Institut Seni Indonesia |
| ISPA | Infeksi Saluran Pernapasan Akut |
| ISSI | Ikatan Sport Sepeda Indonesia |
| ISSI | Indonesia Sharia Stock Index |
| ISTN | Institut Sains dan Teknologi Nasional |
| ITB | Institut Teknologi Bandung |
| ITENAS | Institut Teknologi Nasional |
| ITERA | Institut Teknologi Sumatera |
| ITJ | Indonesian TESOL Journal |
| ITJEN | Inspektorat Jenderal |
| ITPC | Indonesian Trade Promotion Center |
| ITPC | Indonesian Trade Promotion Centre |
| ITS | Institut Teknologi Sepuluh Nopember |