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

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

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

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

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

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