osa

• Osa Peninsula, in Costa Rica
• Osa (canton), in the province of Puntarenas in Costa Rica
• Osa Conservation Area, an administrative area in Costa Rica
• Osa, India, a village in Allahabad, India
• Osa, Iran, a village in Mazandaran Province, Iran
• Osa, Warmian-Masurian Voivodeship, north Poland
• Osa, Norway, a village in Ulvik municipality, Vestland county, Norway
• Osa, Russia, the name of several inhabited localities in Russia
• Osa, Missouri, a community in the United States
• Old Scona Academic High School, a school in Edmonton, Canada
• Oakland School for the Arts

• Osa-class missile boat
• 9K33 Osa (SA-8 Gecko), a Soviet surface-to-air missile launcher
• M79 Osa, a Serbian/Yugoslav rocket launcher
• Avia B.122 Osa, a Czech trainer aircraft
• Osa (handgun) a Russian non-lethal handgun
• Osa (drone), Ukrainian uncrewed aerial vehicle (UAV)

• Optical spectrum analyzer
• Osa (plant), a monotypic genus of plant in the family Rubiaceae

• Obstructive sleep apnea, a sleep-related breathing disorder wherein episodes of upper airway obstruction lead to reduced breathing that interrupts normal sleep
• Osteosarcoma, a malignant neoplasm of bone

• Open Scripting Architecture, for AppleScript
• Open Services Access, a set of standards for mobile telecommunications
• Online Sexual Activity
• Open Systems Adapter, an IBM card for mainframes
• Open systems architecture, a telecommunication standard

• Oceania Swimming Association
• Ontario Soccer Association
• Ontario Society of Artists
• Open Solutions Alliance
• Optical Society of America, now Optica
• Optimization Systems Associates, a defunct American software company
• Order of Saint Anna, a Russian order of chivalry
• Order of Saint Augustine (Ordo Sancti Augustini), the Roman Catholic Augustinian order
• Oregon Student Association
• Organization of the Secret Army, French far-right nationalist group in Algeria
• OSA, a Czech Republic performance rights organisation
• Oriental Society of Australia, now the Australian Society for Asian Humanities
• OSA Group, a Constructivist architectural association of the 1920s based in the USSR
• The Odisha Society of the Americas
• Intelligence-Security Agency of Bosnia and Herzegovina (Obavještajno sigurnosna / bezbjednosna agencija, or OSA-OBA), an intelligence and security agency of Bosnia and Herzegovina
• Office of the Science Advisor, of the United States Environmental Protection Agency
• Office of Special Affairs, a controversial department of the Church of Scientology
• Operation Save America

• Sumire Haruno, Japanese actress, nicknamed Osa
• Osa Maliki (1907–1969), Indonesian politician
• Osa Massen (1914–2006), Danish actress
• Osa Odighizuwa (born 1998), American football player
• Lars Osa (1860–1958), Norwegian artist

• Old Stone Age or Paleolithic
• Office of Secret Actions, a fictional government department in the video game Return to Castle Wolfenstein
• Official Secrets Act, legislation in several countries
• Online Safety Act 2023, United Kingdom legislation
• Online savings account
• Open skies agreement
• Osaka International Airport (former IATA code: OSA)

• Ossa (disambiguation)

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