en OPA

Opa or OPA may refer to:

Arts and media

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

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

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

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

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

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

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

Open Public Alert, a public alert of a gravitational wave event
Optical parametric amplifier, a laser light source that emits light of variable wavelengths

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

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