IHS

IHS may refer to:

• A common Christogram based on the first three letters of "Jesus" in Greek (Ίησους, in Greek capitals ΙΗΣΟΥΣ, or ΙΗϹΟΥϹ using lunate sigmas, semi-Latinized IHSOVS).
• Early Christians, persecuted in the Roman Empire, used the fish as their secret symbol to recognise another member of the Faithful. It is still used to-day and referred to the Fisherman but had a second significance:

The Greek word for "fish" was "Ichthus". I: Iesus, Ch: Christus, Th: Theou (God , possessive), U: Uios pronounced with a "h" (son), S: Soter (redeemer or saviour). Thus "Fish" also stood for Jesus Christus Son of God the Saviour, abbreviated: IHS (Jesus the Son the Saviour).

• Abbreviation for the In hoc signo vinces legend.
• IBM HTTP Server
• Ice Hockey Superleague
• IHS Press, a Catholic publishing house based in Virginia
• IHS Inc., business information and analytics software across capital-intensive industries
• Illinois Humane Society
• Indian Health Service, a division of the United States Department of Health and Human Services
• Indiana Historical Society
• Integrated heat spreader, a copper covering on top of some computer processors
• Institute for Humane Studies
• the British Integrated Household Survey
• International Headache Society
• Institute for Humanist Studies
• Interstate Highway System
• International Horn Society
• IHS, the health care division of Dictaphone
• Intensity, hue, saturation; a synonym for the HSL color space
• Ipswich Historical Society
• Ironclads: High Seas, a steam-ship period tactical naval simulator
• Integrated haplotype score, a statistic used to detect the effects of natural selection operating on human or other genomes.

High schools

• Independence High School (disambiguation) – multiple schools
• International High School (disambiguation) – multiple schools
• Irvington High School (disambiguation) – multiple schools
• Ithaca High School (disambiguation) – multiple schools
• Immaculate High School - Danbury, Connecticut, US
• Indian High School - Dubai, United Arab Emirates
• Inglemoor High School – Kenmore, Washington, US
• Interboro High School – Prospect Park, Pennsylvania, US
• Interlachen High School – Interlachen, Florida, US
• Interlake High School – Bellevue, Washington, US
• Inverkeithing High School – Inverkeithing, Fife, Scotland
• Irondale High School – New Brighton, Minnesota, US
• Irondequoit High School - Irondequoit, New York, US
• Ironton High School – Ironton, Ohio, US
• Ironwood High School – Glendale, Arizona, US
• Irvine High School – Irvine, California, US
• Isabella High School - Maplesville, Alabama, US
• Issaquah High School – Issaquah, Washington, US
• Island High School – Alameda, California, US