Osa

Osa or OSA may refer to:

Places

 * Osa Peninsula, a peninsula in Costa Rica
 * Osa (canton), a 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

Military

 * 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

Science and technology

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

Medicine

 * 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

Computing

 * 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
 * Oversampling

Businesses and organizations

 * Oceania Swimming Association
 * Ontario Soccer Association
 * Ontario Society of Artists
 * Open Solutions Alliance
 * Optical Society
 * Optimization Systems Associates, a defunct American software company
 * Order of Saint Anne
 * 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
 * Orissa Society of the Americas, a non-profit organization that promotes understanding of Oriya culture and history
 * 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
 * Oscilloquartz SA

People

 * 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

Other uses

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