| Acronym | Definition |
|---|
| ISH | International Society of Hypertension (est. 1966; UK) |
| ISH | In Situ Hybridization |
| ISH | Irish Sport Horse |
| ISH | Improved Sanitation and Hygiene |
| ISH | Insert Sarcasm Here (Internet slang) |
| ISH | International School of the Hague (Netherlands) |
| ISH | Isolated Systolic Hypertension |
| ISH | Information Superhighway |
| ISH | In-Situ Hybridisierung (molecular biology) |
| ISH | International Superhits (Green Day album) |
| ISH | Intermediate System Hello |
| ISH | Information Super Highway |
| ISH | Ian Schrager Hotels (New York, NY) |
| ISH | International Society of Hypnosis |
| ISH | It Surely Helped |
| ISH | Image Scan Holdings (UK) |
| ISH | Industry Super Holdings (Australia) |
| ISH | Inner Self-Helper (psychology) |
| ISH | Interactive Search Holdings, Inc. |
| ISH | Internal Self Helper |
| ISH | International Sanitation and Heating (trade show) |
| ISH | Integrated Service Hub (Sprint) |
| ISH | Industrial Safety and Health Program Services |
| ISH | Interim Scout Helicopter |
| ISH | Institute for the Study of Health (Ohio) |
| ISH | Instituti I Studimeve Hidroteknike (Albanian: Institute of Hydrotechnichal Studies & Design) |