Osa

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, Hordaland county, Norway
• Osa, Russia, the name of several inhabited localities in Russia
• 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

Medicine

• Obstructive sleep apnea
• Osteosarcoma, a malignant neoplasm of bone

Groups and associations

• Ontario Soccer Association
• Ontario Society of Artists
• Open Solutions Alliance
• Optical Society
• Order of Saint Anne
• Order of Saint Augustine (Ordo Sancti Augustini), the Roman Catholic Augustinian order
• Oregon Student Association
• Organizirana Skupnost Anarhistov (Organized Community of Anarchists), a Slovenian local/regional anarchist group.
• Organization of the Secret Army, French far-right nationalist group in Algeria who fought against its independence
• OSA, Czech Republic Performance rights organisation
• 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

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

People

• Osa, nickname of former Takarazuka Revue actress Sumire Haruno
• Lars Osa (1860–1958), Norwegian artist

Other uses

• Old Stone Age (Paleolithic)
• Osa (plant), a genus of plants in the Rubiaceae family
• Office of the Science Advisor of the United States Environmental Protection Agency
• Office of Secret Actions, a fictional government department in the video game Return to Castle Wolfenstein
• Office of Special Affairs, a controversial department of the Church of Scientology
• Official Secrets Act
• Online Savings Account
• Open skies agreement
• Operation Save America
• Optical Spectrum Analyzer
• Osaka International Airport, by former airport code
• Oscilloquartz SA