ASO or Aso may refer to: Geography Aso (river), a river in Italy Aso River, in Democratic Republic of the Congo Aso, Kumamoto, Japan Asō, Ibaraki, a former Japanese town located in Namegata District that is now part of the city of Namegata Mount Aso, a mountain in Japan Aso Rock, a large outcrop on the outskirts of Abuja, Nigeria Ships Japanese cruiser Aso (1905–1932) Aso-class patrol vessel, a class of large patrol vessels of the Japan Coast Guard, named after Mount Aso As abbreviation Medicine Allele-specific oligonucleotide Antisense oligonucleotide Anti-streptolysin O Arterial switch operation Arteriosclerosis obliterans Orchestras Adelaide Symphony Orchestra Albany Symphony Orchestra American Symphony Orchestra Amman Symphony Orchestra (since 2015, the JOrchestra) Annapolis Symphony Orchestra Antwerp Symphony Orchestra Appalachian Symphony Orchestra Arkansas Symphony Orchestra Atlanta Symphony Orchestra Austin Symphony Orchestra Technology Analogue switch/sign-off, part of the digital television transition App store optimization Other uses ASO, general secondary education (Algemeen Secundair Onderwijs in Dutch) in Belgium Aso (Pugad Baboy story arc), part of the Philippine comic strip Pugad Baboy ASO, another name for the arcade game Alpha Mission Academy Sports + Outdoors, American retail chain Address Supporting Organization, an Internet-protocol advisory group affiliated with ICANN Administrative services organization, a company that provides human-resources and other administrative functions to client companies Amaury Sport Organisation, organiser of the Tour de France and other sporting events ASO or "anvil-shaped object", a cheap anvil made of inferior materials Arbitrary slice ordering, an algorithm for loss prevention during image or video compression App store optimization, a process of improving the visibility of a mobile app in an App Store Areostationary orbit, a circular synchronous orbit around Mars in the equatorial plane Australian Screen Online, online database of the Australian National Film and Sound Archive People with the surname Aso (surname) See also Aso Villa, the office and residence of the Nigerian President