GMI may refer to:
Educational and research institutions General Motors Institute of Technology, in Flint, Michigan, United States Genomic Medicine Institute, at the Cleveland Clinic, Ohio, United States Georgia Medical Institute, in Georgia, United States Georgia Military Institute, in Marietta, Georgia, United States German-Malaysian Institute, in Malaysia Gorgas Memorial Institute for Health Studies, a medical research institution in Panama Greenwich Maritime Institute, of the University of Greenwich, England Gregor Mendel Institute, a biological research institute in Austria
Enterprises and organizations General Mills Inc George C. Marshall Institute, an American think tank Global Methane Initiative, an environmental organization GMInsideNews, an internet forum focused on General Motors Grace Ministries International, a Christian organization Greater Ministries International, an American Christian ministry that ran a Ponzi scheme Groupement Mixte d'Intervention, a French Cold-War-era counter-intelligence service
Transport Gasmata Airport, in Papua New Guinea Germania (airline), a German airline Gond Umri railway station, in Maharashtra, India
Other uses GamesMaster International, a British magazine Giant magnetoimpedance Global microbial identifier Global Militarization Index GPM Microwave Imager (see Global Precipitation Measurement) Graded motor imagery, a therapy for Complex regional pain syndrome (CRPS) Guaranteed minimum income .gmi, a file extension used by Gemini (protocol)