IGM may refer to:
- Initiative on Global Markets, at the University of Chicago Booth School of Business
 - IG Metall, German metalworkers' union
 - IGM Financial, Canada
 - Institut Gaspard Monge, at the University of Marne la Vallée
 - International Grandmaster, a chess title
 - Intergalactic medium
 - Kingman Airport (Arizona) (IATA Code: IGM)
 - Istituto Geografico Militare, Italian national mapping agency
 - Intersex genital mutilation
 
Medicine
- Immunoglobulin M, an antibody
 
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