OPA
Arts and media
Fictional characters and entities
- Olivia Pope & Associates, a fictional crisis management firm in Scandal (TV series)
- Outer Planets Alliance, a fictional organization in James S.A. Corey's Leviathan Wakes books and the TV series The Expanse based upon them
- Opa-Opa, a character in the Fantasy Zone video game series
Film
- Opa!, a film starring Matthew Modine, Kosta Zorbas and Agni Scott
Music
- Opa (Uruguayan band), Uruguayan jazz group
- Opa (Swedish band), a Swedish musical band
- "Opa" (Giorgos Alkaios song), 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 Opa (album), an alternative name to the album Mera Me Ti Mera by Antique
Laws and international agreements
- Obscene Publications Act 1959, an Act of Parliament in the United Kingdom
- Oil Pollution Act of 1990, a United States law
- Ouagadougou Peace Agreement, that put an end to the Ivorian Civil War
- Outward Processing Arrangement, a trade agreement between Hong Kong and mainland China
Organizations
Government agencies
- Office of the Pardon Attorney, an agency of the United States Department of Justice
- Office of Population Affairs, a United States agency providing advice on population issues
- Office of Price Administration, a United States government office set up to stabilize prices and coordinate rationing after the outbreak of World War II
- Oil and Pipelines Agency, a United Kingdom agency
- Ontario Power Authority, a government agency in Canada
Other organizations
- FC OPA, an association football club from Oulu, Finland
- Postnominal letters used by the Anglican Order of Preachers (Ordo Praedicatorum Anglicanus)
- Online Privacy Alliance, a coalition of Internet companies
- OPA co. ltd. (Oriental Park Avenue), a Japanese clothing retail chain and subsidiary of Daiei
- Ordre des Palmes Academiques, an Order of Chivalry of France for academics and cultural and educational figures
- Oregon Pioneer Association, a fraternal-lineage society first established as the Oregon Pioneer Society in 1867
- Oregon Potters Association, a not-for-profit group of clay artists
People
- Opa Muchinguri, a Zimbabwean politician
- Opa Nguette, a French footballer
- Opa, nickname of Dorus Rijkers, Dutch lifeboat captain who rescued over 500 people in his career
Science and technology
Chemistry
- OPA mixture, a mixture used in chemical weapons
- Ortho-phthalaldehyde, a dialdehyde used in the synthesis of heterocyclic compounds and a reagent in the analysis of amino acids
Physics
- Open Public Alert, a public alert of a gravitational wave event
- Optical parametric amplifier, a laser light source that emits light of variable wavelengths
Computing
- Opa (programming language), a web development platform
- Intel Omni-Path architecture, a design for high performance computing
- Open Platform Architecture, a software interface from Ericsson Mobile Platforms for use internally in cellular phones
- Open Policy Agent, an open source policy engine cloud infrastructure from the Cloud Native Computing Foundation
- Oracle Policy Automation, an enterprise applications suite
Medicine
- Oligo Pool Assay, a SNP genotyping platform from Illumina
- 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
Other uses
- Opa! (Greek expression), a Greek interjection used in surprise or celebration
- Opa (roller coaster), a closed roller coaster in Wisconsin
- Toyota Opa, a car
- Opa Station, a North Korean railway station
- OPA grade tea
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