BGS may stand for:

• Bee Gees, a rock and disco group
• Beautiful Game Studios, a computer game developer
• Bethesda Game Studios, a video game developer
• Brasil Game Show, yearly Brazilian video game convention
• Bunny Girl Senpai, Japanese light novel series
• Bubble Gum Simulator, an Incremental Simulator type of game on Roblox, developed by Rumble Studios.

• Below ground surface, in scientific reports; see Australian Aboriginal prehistoric sites
• Baller–Gerold syndrome
• Berkeley gas-filled separator, an instrument that uses a magnetic deflection system filled with gas at low pressure; see Isotopes of flerovium
• Braunstein-Ghosh-Severini Entropy, of a network
• British Geological Survey, an organisation in the United Kingdom
• British Geriatrics Society, the professional body of specialists involved with health care of the elderly in the United Kingdom

• Bandon Grammar School, an independent, fee-paying school in Bandon, County Cork
• Bangor Grammar School, a voluntary school in Bangor, County Down
• Bankstown Grammar School, in Australia
• Bedford Girls' School, an independent grammar school in Bedford, England
• Beverley Grammar School, a state grammar school in Beverley, England
• Bexley Grammar School, a co-educational grammar school in Bexley, England
• Boston Grammar School, in Boston, England
• Bourne Grammar School, in Bourne, England
• Bradford Grammar School, an independent grammar school in Bradford, England
• Brisbane Grammar School, one of the oldest high schools in Queensland, Australia
• Brighton Grammar School, in Melbourne, Australia
• Bristol Grammar School, an independent grammar school in Bristol, England
• Burnham Grammar School, a co-educational grammar school in Burnham, Buckinghamshire
• Bury Grammar School, an independent grammar school in Greater Manchester, England

• Begusarai railway station, Bihar, India, Indian Railways station code
• Bugis MRT station, Singapore, MRT station abbreviation

• Bachelor of General Studies, an interdisciplinary undergraduate-level academic degree
• BackGround Sound, such as in video games and anime
• Beta Gamma Sigma, a business honor society
• Bouquet, Garcin & Schivre, a French electric car manufactured between 1899 and 1906
• Brigadier General Staff, the chief staff officer in a British army Corps
• Bundesgrenzschutz, the German Federal Border Guard, now called the German Federal Police