| Acronym | Definition |
|---|
| IHS | Indian Health Service (HHS) |
| IHS | International Headache Society |
| IHS | International Hotel School (various organizations) |
| IHS | Industrial Hygiene and Safety (various organizations) |
| IHS | Import Health Standard (legal requirement; New Zealand) |
| IHS | Integrated Healthcare Solutions (various locations) |
| IHS | International High School (various locations) |
| IHS | IBM HTTP Server |
| IHS | in Home Systems |
| IHS | Internal Hostile Structured |
| IHS | Institute for Humane Studies |
| IHS | Ideal Home Show (UK) |
| IHS | Information Handling Services (DODISS) |
| IHS | Iesus Hominum Salvator (Latin: Jesus, Savior of Men) |
| IHS | Iowa Health System |
| IHS | Integrated Heat Spreader |
| IHS | Integrative Healthcare Symposium |
| IHS | Interdisciplinary Health Services (various schools) |
| IHS | International Hydrofoil Society |
| IHS | Indiana Historical Society |
| IHS | Institute for Advanced Studies (Vienna) |
| IHS | Interlachen High School (Interlachen, FL) |
| IHS | Inverse Hyperbolic Sine |
| IHS | Idaho Humane Society (Boise, ID) |
| IHS | Innovative Healthcare Solutions (various locations) |
| IHS | Institute of Health Sciences |
| IHS | Indian High School |
| IHS | Institut d'Histoire Sociale (French: Institute of Social History) |
| IHS | Institute for Humanist Studies |
| IHS | In Hoc Signo Vinces (Latin: In this sign thou shalt win) |
| IHS | Immaculata High School (New Jersey) |
| IHS | International Health Summit |
| IHS | International Healthcare Services (various organizations) |
| IHS | Industrial Hygiene Services |
| IHS | Integrated Healthcare Services (various locations) |
| IHS | Irvington High School (Irvington, NJ) |
| IHS | Interstate Highway System |
| IHS | Integrated Household Survey (UK) |
| IHS | International Horn Society |
| IHS | In His Service |
| IHS | Israel Heart Society (est. 1952) |
| IHS | I Hope So |
| IHS | In-House Suspension |
| IHS | Industrial Hygiene Specialist |
| IHS | Irondequoit High School (Rochester, NY) |
| IHS | Iota-Eta-Sigma (first three letters of Jesus in Greek) |
| IHS | Institute for Housing Studies |
| IHS | International Hydrology Series (collaborative publishing program; UNESCO) |
| IHS | Inglemoor High School (Kenmore, WA) |
| IHS | Instytut Historii Sztuki (Polish: Instute of Art History) |
| IHS | Interboro High School (Prospect Park, PA) |
| IHS | Intelligent Hybrid System (various meanings) |
| IHS | Infocrossing Healthcare Services |
| IHS | International Hyperhidrosis Society |
| IHS | Irving High School (Irving, Texas) |
| IHS | Immokalee High School (Immokalee Florida) |
| IHS | Inglewood High School (California) |
| IHS | Integrated Human Studies (various oranizations) |
| IHS | International Health Specialist (US Air Force) |
| IHS | Irish Heritage Society (various locations) |
| IHS | Isis Horus Seb (Egyptian gods) |
| IHS | Incident Handling System |
| IHS | Institute for Healthcare Studies |
| IHS | Illinois Historical Survey |
| IHS | In House Services |
| IHS | Implant Heating System |
| IHS | Italian Houses for Sale |
| IHS | International Hoplology Society (Sedona, AZ) |
| IHS | Internet Host Service |
| IHS | Integrated Hospital System |
| IHS | Ignatian Heritage Society (Milwaukee, WI) |
| IHS | I Hate School |
| IHS | Inverse Head and Shoulders (economics) |
| IHS | Indiana Area Senior High School (Pennsylvania) |
| IHS | Intelligent Highway Systems |
| IHS | In Hoc Sepulcro (Latin: In This Tomb, epigraphy) |
| IHS | Integrated Headgear System |
| IHS | Integrated Harness Design System (various companies) |
| IHS | Inner Heliospheric Sentinel |
| IHS | International Hibernation Society |
| IHS | Inherited Runners Scored (baseball) |