ISG

• Information Security Group, academic information security group in Royal Holloway, University of London
• Indian School, Al-Ghubra, a K-12 school in Muscat, Oman
• International School of Geneva, an international school in Geneva, Switzerland
• International School in Genoa, an international school in Genoa, Italy
• International School Groningen, an international school in Haren, Netherlands
• ISG Business School, a business school in Paris, France

• Idaho State Guard, active during World War II
• Independent Senators Group, a Canadian Senate parliamentary group
• Interactive Support Group, a defunct CD-I development company
• International Steel Group, a steel company headquartered in Cleveland, Ohio
• Interserve Group, a UK construction company
• Iowa State Guard, active during World War II
• ISG Ltd, a UK construction company

• Integrated Starter-Generator, part of an automotive start-stop system
• New Ishigaki Airport (IATA airport code) on Ishigaki Island, Okinawa, Japan

• In situ gasification, a process in underground coal gasification (UCG)
• Instruction Stream Generator, also called random test generator
• Interferon-stimulated genes, a varied group of genes that are switched on by interferon to tackle viral infection
• International Socialist Group, a Trotskyist group and British section of the Fourth International between 1987 and 2009
• Iraq Study Group, a 2006 congressionally appointed panel charged with assessing the situation in Iraq, also known as the Baker-Hamilton Commission
• Iraq Survey Group, the 2003–2005 investigative mission in the Iraqi WMD search program that produced the Duelfer Report
• Irish Sign Language (ISO 639 code isg)
• Islamic Solidarity Games, multinational multi-sport event

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