The initials SMG may refer to:
Firearms:
- Submachine gun
People:
- Sarah Michelle Gellar, an American actress
- Sunil Manohar Gavaskar, a former Indian cricketer
Organisations:
- Boston University School of Management
- Science Museum Group, a collection of British museums
- Senior Management Group within the United Nations System
- Spaceflight Meteorology Group, a National Weather Service office that forecasts for the U.S. manned spaceflight program
- SMG (property management), a property management company
- Special Mobile Group (SMG) of the European Telecommunications Standards Institute (ETSI)
- Direcção dos Serviços Meteorológicos e Geofisicos, Macao Meteorological and Geophysical Bureau
- SMG plc, a Scottish based media company, now called STV Group plc
- Scottish Minorities Group, former name of Outright Scotland, a gay rights group
In biology:
- Supramarginal gyrus, a part of the parietal lobe of the human brain.
In engineering:
- Sequential manual gearbox, BMW's name for its version of an electrohydraulic manual transmission
In gaming:
- Super Mario Galaxy, a video game for the Wii featuring Nintendo's mascot Mario
- Super Mario Galaxy 2, its sequel
In media:
- Shanghai Media Group, a major television and radio broadcasting company in Shanghai.
- Seacoast Media Group
In music:
- Scandinavian Music Group
- Sex Machineguns, a Japanese metal band
- Sister Machine Gun, an industrial music group
- Sex, Money & Gunz, a rap music group consisting of Ice-T, Smoothe da Hustler, Trigger tha Gambler, Deuce Fever and Marc Live
- Solar Music Group, indie record label founded by Saint Charles that managed rappers E-40, The Click, and B-Legit
Other:
- Santa Monica 13