IG

IG, Ig, or ig may refer to:

Biomedical or technology

• Immunoglobulin, also known as antibody, a protein used by the immune system to identify and neutralize foreign objects such as bacteria and viruses
• Imperial gallon (ig), an Imperial unit of volume defined as 4.54609 litres (1.20095 US gal)
• Insulated glazing, double or triple glass window panes separated by an air or other gas-filled space to reduce heat transfer
• Integrated graphics, the term for a graphics processor that is integrated into the mainboard

Companies

• IG Farben, a former German industrial conglomerate
• IG Group, a UK speculative investment company
• IG Recordings, a record label formed by the Indigo Girls, an American folk/rock duo
• Impressions Games, a defunct United States gaming company
• Internet Group, stylized as "iG", a Brazilian internet service provider
• Production I.G, a Japanese anime company
• Meridiana S.p.A., an Italian airline, by IATA airline designator "IG"

Games

• Imperial Guard (Warhammer 40,000), from the tabletop strategy game Warhammer 40,000
• Imperium Galactica, a 1997 PC CD-ROM game by Hungary-based Digital Reality
• Insomniac Games, an independent video game developer
• Investment Game, an international stock market simulation game
• Invictus Gaming, a Chinese professional E-sports team

Government

• Inspector General, a high-ranking official
• Inspector General of Police
• Inspector General of Prisons

Places

• Ig, Slovenia
• IG postcode area, a group of postcode districts around Ilford, England

Other uses

• Ig Nobel Prize, a parody of the Nobel Prize (ignoble)
• Igbo language, the official language of Nigeria, by ISO 639-1 language code
• Inscriptiones Graecae (IG), a collection of ancient Greek sources
• Instagram
• Italian Greyhound, a breed of dog