# OPA

Opa or OPA may refer to:

## Arts and media
### 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

## 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

* Ambae Island, Vanuatu (also known as Opa)
* Opa (expression), an interjection used in various cultures
* 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