The term OPA may mean:
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
Oil Pollution Act of 1990, a United States law
Ontario Power Authority, a government agency in CanadaOpa (Dutch: Grandpa), the nickname of
Dorus Rijkers, a lifeboat-captain who rescued over 500 people in the course of his careerOpa!, a
2005 film directed by Udayan PrasadOPA, a mixture of isopropyl alcohol and isopropyl amine used in some binary chemical weapons such as the United States Army
M687OPA refers to
takeovers in a variety of European languages (see other languages at the side of this article)Open Platform Architecture, a software interface from Ericsson Mobile Platforms for use internally in cellular phones
Optical parametric amplifier or Optical Parametric Amplification, a method to amplify laser light
Oropharyngeal airway, a device used to keep the upper respiratory airway open
Outward Processing Arrangement, a trade agreement between Hong Kong and mainland ChinaOPA, Ontario Paramedic AssociationOpa german word for Grandpa
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