| Abbreviation | Definition |
|---|---|
| ICH | Institute for Constitutional History |
| ICHAT | Internet Criminal History Access Tool |
| ICHD | International Commission for Historical Demography |
| ICHD | International Committee for Historical Demography |
| ICHE | Indiana Council for History Education |
| IDAP | Improved Damage Assessment of Parchment |
| IDAP | International Directory of Aegean Prehistorians |
| IEHC | International Economic History Congress |
| IEHG | International Environmental History Group |
| IESH | Irish Economic and Social History |
| IGHR | Instititute of Genealogy and Historical Research |
| IGHR | Institute of Genealogical and Historical Research |
| IGTH | Institute for Global and Transnational History |
| IHAC | Institute for the History of Ancient Civilizations |
| IHC | Indianapolis History Center |
| IHM | Images from the History of Medicine |
| IHNS | Institute for the History of Natural Science |
| IHNS | Institute for the History of Natural Sciences |
| IHO | International History Olympiad |
| IHR | Internet History Resources |