| Acronym | Definition |
|---|
| IHS | Indian Health Service (HHS) |
| IHS | Information Handling Services (DODISS) |
| IHS | IBM HTTP Server |
| IHS | International Headache Society |
| IHS | Institute for Advanced Studies (Vienna) |
| IHS | Institute for Humane Studies |
| IHS | Institute for Humanist Studies |
| IHS | Indiana Historical Society |
| IHS | Integrated Heat Spreader |
| IHS | International Hydrofoil Society |
| IHS | Iowa Health System |
| IHS | Institute of Health Sciences |
| IHS | Iesus Hominum Salvator (Latin: Jesus, Savior of Men) |
| IHS | Integrated Household Survey (UK) |
| IHS | International Horn Society |
| IHS | In Hoc Signo Vinces (Latin: In this sign thou shalt win) |
| IHS | In His Service |
| IHS | Interstate Highway System |
| IHS | I Hope So |
| IHS | Indian High School |
| IHS | Irvington High School (Irvington, NJ) |
| IHS | Immaculata High School (New Jersey) |
| IHS | Iota-Eta-Sigma (first three letters of Jesus in Greek) |
| IHS | Instytut Historii Sztuki (Polish: Instute of Art History) |
| IHS | Irondequoit High School (Rochester, NY) |
| IHS | Institute for Housing Studies |
| IHS | Isis Horus Seb (Egyptian gods) |
| IHS | Immokalee High School (Immokalee Florida) |
| IHS | In House Services |
| IHS | Implant Heating System |
| IHS | International Hoplology Society (Sedona, AZ) |
| IHS | Irving High School (Irving, Texas) |
| IHS | I Hate School |
| IHS | Intelligent Highway Systems |
| IHS | Interboro High School (Prospect Park, PA) |
| IHS | Integrated Hospital System |
| IHS | Indiana Area Senior High School (Pennsylvania) |
| IHS | In Hoc Sepulcro (Latin: In This Tomb, epigraphy) |
| IHS | Integrated Headgear System |
| IHS | International Hibernation Society |
| IHS | Inner Heliospheric Sentinel |
| IHS | Inherited Runners Scored (baseball) |