OPA

The term OPA may mean:

• The Outward Processing Arrangement in Hong Kong.
• An Out of Place Artifact, an artifact which surpasses the known technological era of where it was discovered.
• 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
• Own a piece of america or 'Own a Piece of America', A marketing company that sells land deeds as novelty gifts.
• acronym for Offerta Pubblica di Acquisto an italian Stock exchange term
• The Office of Price Administration setup during WWII by President Franklin Delano Roosevelt to combat inflation.