| Abbreviation | Definition |
|---|---|
| ISILKP | Islamic State of Iraq and the Levant – Khorasan Province |
| ISIS | Imbecilic Secular Impertinent Satans |
| ISIS | Insane Shari-ah Islamic Shiz |
| ISKCON | International Society for Krishna Consciousness |
| ISKP | Islamic State Khorasan Province |
| ISKP | Islamic State of Iraq and the Levant – Khorasan Province |
| ISLAM | I Sincerely Love All Muslims |
| ISMC | International Student Ministries Canada |
| ISNA | Islamic Society of North America |
| ISNB | Islamic Society of Northern Baltimore |
| ISOV | Islamic Schools of Victoria (Werribee College) |
| ISSL | International Sunday School Lessons |
| ISV | International Standard Version |
| ISWAP | Islamic State of West African Province |
| ISWAP | Islamic State West African Province |
| ITB | In The Bond |
| ITBC | Indonesia Taiwan Buddhist Community |
| ITBC | Indonesia Theravada Buddhist Centre |
| ITC | Interdenominational Theological Center |
| ITCC | International Theological Correspondence College |