| Acronym | Definition |
|---|
| IGM | Indexed GEDCOM Method |
| IgM | Immunoglobulin M (antibody) |
| IGM | Intergalactic Medium (astronomy, cosmology) |
| IGM | Instituto Geográfico Militar (Spanish) |
| IGM | Istituto Geografico Militare (Italy) |
| IGM | Insanely Great Mac |
| IGM | Internet Grateful Med |
| IGM | Intergovernmental Meeting |
| IGM | Istituto Di Genetica Molecolare (Italy; CNR) |
| IGM | Institut für Geschichte der Medizin der Robert Bosch Stiftung (German) |
| IGM | International Grandmaster (chess) |
| IGM | Institute of Genetic Medicine (Johns Hopkins Medicine) |
| IGM | Industrija Gradbenega Materiala (Slovenia) |
| IGM | Instituto de Genetica Medica (Portugese) |
| IGM | Import General Manifest (Pakistan customs) |
| IGM | Internet Game Maker |
| IGM | Intragroup Medium |
| IGM | Institut für Geophysik und Meteorologie (German) |
| IGM | Inheritable Genetic Modification |
| IGM | Instituto Geológico Mineiro (Portugal) |
| IGM | Instantaneous Gain Modulation |
| IGM | Intersex Genital Mutilation |
| IGM | Intergalactic Media |
| IGM | International Golf Maintenance |
| IGM | Informa Global Markets |
| IGM | Image Geometry Model |
| IGM | Kingman, AZ, USA - Mohave County (Airport Code) |
| IGM | I Got Mine |
| IGM | Institute for Global Mobility |
| IGM | Industrial Ghetto Metal (band) |
| IGM | Intergas Marketing |
| IGM | Iterative Guidance Mode |
| IGM | IGetMail (Lockstep) |
| IGM | Integrated Geological Modelling |
| IGM | Institute for Global Management |
| IGM | In-Game Mail (computer gaming communication) |
| IGM | Institut Degénétique et Microbiologie (French) |
| IGM | Ingenieurgesellschaft für Geophysikalische Messtechnik (German) |
| IGM | Informatique Gestion Management (French) |
| IGM | Ignoring Gravity Music |
| IGM | International Granite and Marble, Corporation |
| IGM | Ispettorato Generale Motorizzazione (Italian) |
| IGM | Input Grooming Module |
| IGM | International Graphic Machinery (Belgium) |
| IGM | Industriegewerkschaf Metall (Labor Union Metal) |
| IGM | Ingo G Michel |
| IGM | Internal Growth Manager |
| IGM | Inhomogeneous Gibbs Models |
| IGM | Industrija Gradevinskog Materijala (Serbia and Montenegro) |
| IGM | Internet Gateway Multicast |