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IS

Last updated November 11, 2025

IS may refer to:

Independent Sector, an American philanthropic coalition
Intermediate school, education between primary and secondary schools areas, also known as middle school
Ilta-Sanomat , a newspaper in Finland
Intelligent Systems, a first-party video game developer and internal team of Nintendo
International Socialists (disambiguation), several Trotskyist political organizations
Investment—Saving, a curve in the IS/LM model of economics
IRS Airlines (IATA code)
Island Airlines (IATA code)

Is, the third-person singular present tense of the English language verb "to be", frequently used as a copula
Icelandic language (ISO 639-1 alpha-2 code)
International Sign, a pidgin sign language
Is (rune) (ᛁ), a rune of the Anglo-Saxon fuþorc

Immune system, organic mechanisms that protect against disease
Immunosuppression
Importance sampling, a statistical technique for estimating properties of a particular distribution
Infrasound, sound frequencies below the human range of hearing
Insertion sequence, a short DNA transposable element
Intersex, an organism with sex characteristics neither exclusively male nor female

.is, the Internet country-code top-level domain for Iceland
Information science, the study of data collection, manipulation, and dissemination
Information systems, organizations of data-processing persons, records, and activities
InstallShield, a software tool for creating software installers for Microsoft Windows
IntelliStar, a computer system used to display local forecasts on The Weather Channel
the relational operator is, used in Python
the type comparison operator is, used in C#

IS tank, a Soviet heavy tank in World War II.
Istrebitel Sputnikov or "Destroyer of Satellites", a Soviet anti-satellite weapons program.
Lexus IS, a sports car made by Lexus.
Locomotive IS, a Soviet passenger steam locomotive.
Nikitin-Shevchenko IS, a Soviet fighter aircraft.

Image stabilization, a family of techniques to reduce blur caused by lens shakes
Canon Image Stabilizer, a lens-based image stabilization technology by Canon
Intrinsic safety, a protection technique for electronic equipment in explosive atmospheres
Indian Standard, developed by the Bureau of Indian Standards, for example IS 456
International Standard, a mounting standard for the calipers and rotors of disc-type bicycle brake systems

Internal security, the work of keeping domestic peace by a national force
International studies, or International relations, the study of politics, economics and law on a global level
Intervention specialist, the title of a special education teacher in some states of the U.S.A.
Is, in is-ought philosophy, a fact or empirical state with finite limits in space and time
Old Israeli Shekel, commonly denominated as IS
Islamic State, transnational Salafi jihadist group and unrecognized quasi-state