# OCA

OCA or Oca may refer to:

## Places and jurisdictions

* The ancient town and bishopric Oca in Asia Minor (present Asia Turkey), now a Latin Catholic titular see
* The former Spanish Oca, modern Villafranca Montes de Oca, also see of a medieval bishopric (Auca), now a Latin Catholic titular see
* Oca (river), a tributary of the Ebro, Spain, having its source in the comarca of Montes de Oca
* Côte d'Azur Observatory, French name: Observatoire de la Côte d'Azur
* Cerro Armazones Observatory
* Orange County Airport, several airports in the United States
* Oregon Coast Aquarium
* Iruña de Oca, Spanish municipality

## Business and society

* Odisha Cricket Association, state cricket body of BCCI
* Open Content Alliance, consortium of organizations contributing to a publicly accessible archive of digitized texts
* Optimum currency area, geographical region which efficiently shares a single currency
* Oregon Citizens Alliance, conservative Christian political activist organization
* Organic Consumers Association, consumer protection and organic agriculture advocacy group
* Organization of Chinese Americans, national Asian Pacific American social and civic organization
* Oxford Conservative Association, student political organisation at the University of Oxford

## Education

* Oakland Charter Academy, a member school of Amethod Public Schools
* Ontario College of Art, former name for OCAD University
* Open College of the Arts

## Government

* Court of Appeal for Ontario, frequently referred to as the Ontario Court of Appeal
* Office of Consumer Affairs (Canada), government agency of Industry Canada
* Olympic Council of Asia, governing body of sports in Asia
* Organised and Financial Crime Agency of New Zealand, formerly known as the Organised Crime Agency
* Organized Crime Agency of British Columbia (1999–2004), predecessor of the Combined Forces Special Enforcement Unit
* Outback Communities Authority, an authority providing municipal services to communities in Outback South Australia

## Medicine

* OCA1, a gene associated with oculocutaneous albinism
* Oculocutaneous albinism, a form of albinism involving the eyes and skin
* ortho-Chloroamphetamine, an amphetamine

## Religion

* Orthodox Church in America, autocephalous Eastern Orthodox Church in North America
* Oxford Capacity Analysis, also known as the American Personality Analysis, a personality test used in Scientology

## Technology

* Odoo Community Association, an organization supporting the Odoo (formerly OpenERP) community
* Open Control Architecture, network control protocol for audio and video devices (AES70)
* Optically Clear Adhesives, bonding agents used for light-emitting devices like OLED and LEC; see Liquid optically clear adhesive
* Oracle Certified Associate, a level of the Oracle Certification Program

## Other uses

* Oca (structure), a kind of Brazilian indigenous dwelling
* Oxalis tuberosa, a South American tuber known as oca in Spanish
* Offensive counter air, military term
* Old Croton Aqueduct, especially when referring to the hiking trail
* Open coloring axiom in mathematics
* Operation Crossroads Africa, a volunteer organization
* Optical clearing agent, substance used in microscopy to make samples transparent
* Orange County Astronomers, an amateur astronomy club based in Orange County, California