OPA

Opa or OPA may refer to:

Fictional characters and entities

 * Olivia Pope & Associates, a fictional crisis management firm in Scandal
 * 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 (Swedish band), a pop/folk band formed in 2012
 * Opa (Uruguayan band), a 1969-1977 US-based jazz fusion group
 * "Opa" (song), by Giorgos Alkaios, representing Greece at Eurovision 2010
 * "Opa Opa", a 1992 song by Notis Sfakianakis; covered by Antique (1999) and Despina Vandi (2004)
 * Opa Opa (album), or Mera Me Ti Mera, by Antique, 1999

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

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

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

 * Ambae Island, Vanuatu (also known as Opa)
 * 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
 * Maricopa people, a Native American tribe