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, England 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 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