| Abbreviation | Definition |
|---|---|
| HVCS | Hickory Valley Christian School |
| HVCS | Huron Valley Catholic School |
| HYT | Highest Yoga Tantra |
| I | Intercession |
| IA | ImpactAliyah |
| IA | Innocent Angel |
| IA | Inshallah (If God wills) |
| IABCS | International Association of Baptist Colleges and Schools |
| IACO | Inter-faith Association of Central Ohio |
| IACS | Illinois Association of Christian Schools |
| IADOM | It All Depends On Me |
| IAIE | International Association for Islamic Economics |
| IAM | Incest and Abuse in the Ministries |
| IAPC | International Association of Pastoral Counselors |
| IAPR | International Association for the Psychology of Religion |
| IAS | International Association of Scientologists |
| IATM | International Association for Theophostic Ministry |
| IAW | Islam Awareness Week |
| IB | Independant Baptist |
| IBB | Islamic Bank of Brunei |