Gef may refer to a supposed talking mongoose from the Isle of Man
Gef or GEF may also refer to:
Organization Global Enrichment Foundation, a Canadian humanitarian organization Global Environment Facility, an intergovernmental environmental organizations Global Equality Fund, of the United States Department of State Global Esports Federation, an international esports organization based in Singapore Green European Foundation, a European political foundation Greif, Inc., an American manufacturing company
Science and technology Graphical Editing Framework, a software framework Guanine nucleotide exchange factor, a group of proteins
Other use Greek Expeditionary Force (Korea), during the Korean War