| Abbreviation | Definition |
|---|---|
| IEA | Islamic Emirate of Afghanistan |
| IEBI | Islamic Educational Board of India |
| IECE | Irish Episcopal Commission for Emigrants |
| IET | Islamic Education Trusth |
| IF | Invincible Fellowship |
| IFA | International Freezone Association |
| IFACS | Institute for Advanced Christian Studies |
| IFAM | Islamic Forum for Australian Muslims |
| IFB | Independent Fundamental Baptist |
| IFBC | Indiana Fundamental Bible College |
| IFBC | Inman First Baptist Church |
| IFBC | International Fellowship of Bible Churches |
| IFCA | International Federation of Catholic Alumnae |
| IFCA | International Fellowship of Christian Assemblies |
| IFCB | International Fellowship of Christian Businessmen |
| IFCO | Interreligious Foundation For Community Organizing |
| IFCO | Inter-religious Foundation for Community Organizing |
| IFCU | International Federation of Catholic Universities |
| IFEW | Islamic Foundation for Education and Welfare |
| IFFG | Islamic Finance Focus Group |