OPA

OPA may refer to:

Computer Science

• Opa, a web development platform.

German

• (der) Opa, German for "Grandpa"

Government

• Office of the Pardon Attorney, an agency of the United States Department of Justice
• Office of Price Administration, a United States government office set up by President Roosevelt to stabilize prices and rents after the outbreak of World War II
• Ontario Power Authority, a government agency in Canada

International agreements

• Ouagadougou Peace Agreement, that put an end to the Ivorian Civil War
• Outward Processing Arrangement, a trade agreement between Hong Kong and mainland China

Laws

• Obscene Publications Act 1959, an Act of Parliament in the United Kingdom
• Oil Pollution Act of 1990, a United States law

Medicine

• Oropharyngeal airway, a device used to keep the upper respiratory airway open
• Out-patient appointments
• Ovine Pulmonary Adenocarcinoma, a disease of the lungs in sheep and goats, also known as Jaagsiekte

Music

• "OPA", a song by Giorgos Alkaios & Friends competing in the Eurovision Song Contest 2010 for Greece.
• "Opa Opa", a song by Notis Sfakianakis, later covered by both Antique and Despina Vandi.
• "Opa (band)", Brazilian jazz group
• Opa Opa, an alternative name to the album Mera Me Ti Mera by Antique.
• Opa! (Bato) is a Melbourne, Australia based Balkan Brass Orchestra.

Sports

• FC OPA, association football club from Oulu, Finland.

Other

• Office of Price Administration (WWII)
• Oligo Pool Assay, a SNP genotyping platform from Illumina
• Online Privacy Alliance, a coalition of Internet companies
• Ordre des Palmes Academiques, an Order of Chivalry of France for academics and cultural and educational figures
• Open Platform Architecture, a software interface from Ericsson Mobile Platforms for use internally in cellular phones
• Optical parametric amplifier, a method to amplify laser light
• Oracle Policy Automation, an enterprise applications suite
• Oregon Potters Association, not-for-profit group of clay artists
• Opa, the nickname of Dorus Rijkers, Dutch lifeboat-captain who rescued over 500 people in the course of his career
• OPA co., ltd. (Oriental Park Avenue), a Japanese clothing retailer
• OPA, a mixture used in chemical weapons such as M687
• ortho-phthalaldehyde, a chemical compound
• Opa, Dutch or German informal word for grandfather
• Opa! Portuguese interjection of surprise, astonishment
• Opa!, Greek word of cheer, used in multiple countries with Greek influence including Greece, Cyprus, Albania, Bulgaria, Russia, Serbia, Romania, Turkey, and Israel.
• Opa!, a film starring Matthew Modine and Agni Scott.
• Postnominal letters used by the Anglican Order of Preachers (Ordo Praedicatorum Anglicanus)
• Owners Protecting Agents (in shipping)

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