ICG may refer to
*ICG Communications
*Illinois Central Gulf Railroad
*Impedance cardiography, a hemorheology technique for detecting the properties of the blood flow in the thorax
*Incitement to commit genocide
*Indian Coast Guard
*Icelandic Coast Guard
*Indocyanine green
*Institute of Cosmology and Gravitation, University of Portsmouth, Institute of Cosmology and Gravitation, University of Portsmouth, England
*Defence Intelligence Staff#DI ICG, Intelligence Collection Group, part of the United Kingdom's Defence Intelligence Staff
*Intermediate Capital Group, a private equity and mezzanine capital firm based in London
*International Children's Games, an International Olympic Committee-sanctioned sport event held every year
*International Coal Group
*International College for Girls, former name of IIS University
*International Crisis Group, a non-profit organisation
*Internet Capital Group
*Inversive congruential generator
*Intra-character gap (or inter-character gap) in American Morse code#History, American Morse code
*Irish Continental Group, an Irish sea shipping firm
*Independent Comics Group, an imprint of Eclipse Comics
*''International Committee on Global Navigation Satellite Systems'' (ICG) by United Nations Office for Outer Space Affairs
*International Composers' Guild
*International Cinematographers Guild
*Integrated clock gating, in logic chips
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