AGS may be
- an abbreviation for Alagille syndrome A complex, dominantly inherited multisystem disorder involving primarily the liver, heart, eyes, face, and skeleton
- an abbreviation for Auckland Grammar School
- an abbreviation for Adams' Grammar School
- the US Navy hull classification symbol for Surveying Ship
- Adventure Game Studio, software by Chris Jones for creating point-and-click adventure games. [1]
- the Americans For Gun Safety Foundation
- Alpha Gamma Sigma, a honor society in California
- American Glovebox Society
- Automobiles Gonfaronnaises Sportives, a defunct Formula 1 team
- American Gemological Society
- American Geographical Society
- An abbreviation for Arkansas Governor's School
- The product code for Nintendo's Game Boy Advance SP
- The National Rail code for Argyle Street railway station, United Kingdom. External links: station information; Template:Mmukpcloc; live departures and arrivals.