BMG may refer to:
- .50 BMG, a cartridge developed for the Browning .50 Caliber machine gun in the late 1910s
- Bank Mendes Gans, a Dutch bank, founded in 1883 and located in the centre of Amsterdam
- Bertelsmann Music Group, a division of Bertelsmann before the sale of its assets on October 1, 2008
- Beth Medrash Govoha, a Haredi yeshiva in Lakewood Township, New Jersey
- Bill & Melinda Gates Foundation, the largest transparently operated private foundation in the world
- Blue Man Group, a creative organization that produces theatrical shows and concerts featuring music, comedy and multimedia
- Borussia Mönchengladbach, a German football club based in Mönchengladbach, North Rhine-Westphalia
- Bulk metallic glasses, a type of amorphous metal
- Indonesian Agency for Meteorology, Climatology and Geophysics (previously Badan Meteorologi dan Geofisika), the Indonesian non-departmental government agency for meteorology, climatology, and geophysics
- Monroe County Airport (Indiana) (IATA code: BMG), a county-owned public-use airport
- Red Army Faction (previously Baader-Meinhof Group), one of post–World War 2 Germany's most violent and prominent left wing groups