BGS may stand for:
- Bachelor of General Studies, an undergraduate degree, similar to a Bachelor of Arts
- Background Sound, such as in video games and anime
- Bangor Grammar School, a voluntary school in Bangor, County Down
- Bankstown Grammar School, in Australia
- Beautiful Game Studios, a computer game developer
- Bee Gees, a Grammy Award-winning soft rock and disco group
- Beta Gamma Sigma, a business honor society
- Bethesda Game Studios, a video game developer
- Berkeley gas-filled separator, an instrument that uses a magnetic deflection system filled with gas at low pressure
- Beverley Grammar School, a state grammar school in Beverley, England
- Bexley Grammar School, a co-educational grammar school in Bexley, England
- Big green sign, a term used among roadgeeks for a highway guide sign in states where green is used
- Boston Grammar School, in Boston, England
- Bouquet, Garcin & Schivre, a French electric car manufactured between 1899 and 1906
- Bourne Grammar School, in Bourne, England
- Bradford Grammar School, an independent grammar school in Bradford, England
- Brigadier General Staff, the chief staff officer in a British army Corps
- Brisbane Grammar School, one of the oldest high schools in Queensland, Australia
- Bristol Grammar School, an independent grammar school in Bristol, England
- Brighton Grammar School, in Melbourne, Australia
- British Geological Survey, the United Kingdom's premier centre for earth science information and expertise
- Bundesgrenzschutz, the German Federal Border Guard, now called the German Federal Police
- Bury Grammar School, an independent grammar school in Greater Manchester, England
- Braunstein-Ghosh-Severini Entropy, of a network