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

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