Iraqi Governing Council, the provisional government of Iraq from July 13, 2003 to June 1, 2004

International Gliding Commission, a division of the Fédération Aéronautique Internationale

Intergovernmental Conference, the formal procedure for negotiating amendments to the founding treaties of the European Union

Inertial guidance system, an Inertial Measurement Unit combined with a set of guidance algorithms and control mechanisms

Instituto Gulbenkian de Ciência, an institute for biomedical research and education

Institute for Global Communications, an institution that provides Internet presence for groups deemed "progressive"