ALG may refer to:
Airfields Advanced Landing Ground, temporary airfields created by the Allies in World War II ALG Wormhout, the Advanced Landing Ground home base of 'B' Flight, 665 (AOP) Squadron RCAF, near Dunkirk, France Houari Boumediene Airport (IATA airport code ALG), Algiers, Algeria
Enterprises and organizations ALG, a company that provides information on future residual values of vehicles; purchased by TrueCar in 2011 American Laser Games, a former US company Apple Leisure Group, a US travel company Association of London Government, a local government association in England Art. Lebedev Group, the holding company which owns Art. Lebedev Studio Liptako–Gourma Authority (Autorité du Liptako-Gourma), a regional development organization in Africa
Science and technology Anti-lymphocyte globulin, an immunosuppressive drug Application-level gateway, in computer networking
Sports A-League, a domestic football league in Australasia ALG Spor, a football club in Gaziantep, Turkey
Other uses Algeria, IOC and UNDP country code Algonquian languages (ISO 639 code ALG) Automatic Language Growth, an approach to language learning/teaching