GCI may refer to: Education Galt Collegiate Institute, in Cambridge, Ontario, Canada Glebe Collegiate Institute, in Ottawa, Ontario, Canada Global Change Institute, at the University of the Witwatersrand, Johannesburg, South Africa Global Cinematography Institute, in Los Angeles, California, United States Government College Ikorodu, in Lagos State, Nigeria Environmentalism Glen Canyon Institute, in Utah, United States Green Cross International, an International environmental organization Green Campus Initiative (UCT), a student organization at the University of Cape Town Science, medicine and technology GCI (company), an American telecommunications company Gaussian correlation inequality Generalized conversational implicature Geomagnetically induced current Glial cytoplasmic inclusions, a type of abnormal protein deposit in the brain Google Code-in, an annual programming contest Ground-controlled interception Transportation Guernsey Airport, in the Channel Islands GCI coach, the staple of Belgian passenger rail traffic in the steam era Other uses International Conference on the Situation in Venezuela (Spanish: Grupo de Contacto Internacional) First Geneva Convention Gannett Company, an American newspaper publisher Getty Conservation Institute, an American art conservation organization Global Competitiveness Index Grace Communion International, a Christian denomination Grassroots Campaigns, Inc., an American political consulting organization Great Coasters International, an American roller coaster builder Great Commission International, an American religious organization