IG, Ig, or ig may mean:
Biology:
- Immunoglobulin
- Immature granulocyte
Places:
- Ig, a town and a municipality in Slovenia
- IG postcode area, a group of postcode districts around Ilford, England
Terms:
- Inspector General (civilian or military administration), a high-ranking official charged with the mission to inspect and report on some bodies in his field of competency
- Igbo language, the official language of Nigeria (ISO 639 alpha-2, ig)
- Insulated glass
Companies:
- IG Farben, a German industrial conglomerate
- IG Group, a UK speculative investment company
- iG - internet Group, a Brazilian internet service provider
- Production I.G, a Japanese anime company
- Impressions Games, a defunct United States gaming company
- IATA airline designator for Meridiana Fly
Games:
- Imperial Guard, from the tabletop strategy game, Warhammer 40,000 Universe
- Imperium Galactica, a 1997 PC CD-ROM game by Hungary-based Digital Reality
- Insomniac Games, an online slang term used by members of its community
- Instagib, a mutator in various first person shooter games such as Unreal Tournament, Unreal Tournament 2003, and Unreal Tournament 2004
- Investment Game, an international stock market simulation game
Government:
- Inspector General
- Inspector General of Police
- Inspector General of Prisons
Other:
- Ig Nobel Prize, a parody of the Nobel Prize (ignoble)
- Inspector Gadget, a cartoon television show and movie
- Italian Greyhound, a breed of dog
- Islamic Group (Al-Gama'a al-Islamiyya), a militant Egyptian Islamist movement
- Inverse gamma distribution, a common continuous distribution in Statistics
- iGoogle, Google's personalized homepage
- Indigo Girls, a folk/rock duo from the United States
- Inscriptiones Graecae, a collection of ancient Greek sources
- Integrated Graphics, graphics processor is integrated into the mainboard
- Image Generator, for generation of images in 2D and 3D simulations