OCA or Oca may refer to:

Places and jurisdictions

* The ancient town and bishopric

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 bis ...

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 Cerro Armazones Observatory (Spanish: ''Observatorio Cerro Armazones,'' OCA; German: ''Observatorium Cerro Armazones,'' OCA) was an astronomical observatory owned and operated jointly by the Ruhr University Bochum (RUB) and the Catholic Universit ...

Orange County Airport John Wayne Airport is a commercial and general aviation airport that serves Orange County, California, and the Greater Los Angeles area. The airport is located in an unincorporated area of Orange County, and it is owned and operated by the cou ...

, 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 OCA-Asian Pacific American Advocates (previously known as the Organization of Chinese Americans) is a non-profit organization founded in 1973, whose stated mission is to advance the social, political, and economic well-being of Asian Americans a ...

, national Asian Pacific American social and civic organization *

Oxford Conservative Association The Oxford University Conservative Association (OUCA) is a student Conservative association founded in 1924, whose members are drawn from the University of Oxford. Since October 2009, OUCA has been affiliated to Conservative Future and its su ...

, 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 The Open College of the Arts (OCA) is an open learning arts college, with a Head Office in Barnsley in South Yorkshire, England. Founded in 1987 by Michael Young, it is a registered charity and the distance learning partner of the Universi ...

Government

Court of Appeal for Ontario The Court of Appeal for Ontario (frequently referred to as the Ontario Court of Appeal or ONCA) is the appellate court for the province of Ontario, Canada. The seat of the court is Osgoode Hall in downtown Toronto, also the seat of the Law Societ ...

, frequently referred to as the Ontario Court of Appeal *

Office of Consumer Affairs (Canada) The Office of Consumer Affairs (OCA; french: Bureau de la consommation) is a Government of Canada agency under Innovation, Science and Economic Development Canada, which is responsible for consumer protection and promotion Promotion may refer to ...

, 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

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 * Oca (bishopric), a now titular Catholic see in Asia Minor

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 The Oracle Certification Program certifies candidates on skills and knowledge related to Oracle products and technologies. Credentials are granted based on a combination of passing exams, training and performance-based assignments, depending on the ...

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 Operation Crossroads Africa (OCA) is a non-profit, non-governmental organization working to build links between North America and Africa. It was founded in 1958 by Presbyterian clergyman James Herman Robinson. OCA annually sends groups of young vol ...

, a volunteer organization *

Optical clearing agent Optical sectioning is the process by which a suitably designed microscope can produce clear images of focal planes deep within a thick sample. This is used to reduce the need for thin sectioning using instruments such as the microtome. Many diffe ...

, substance used in microscopy to make samples transparent *

Orange County Astronomers The Orange County Astronomers (OCA) is a 501(c)(3) non-profit, civilian-led astronomy organization in Orange County, southern California. It was formed in 1967 and currently operates with around 800 concurrent members; they offer beginner course ...

, an amateur astronomy club based in Orange County, California