OCA

• Cerro Armazones Observatory
• Court of Appeal for Ontario
• Croton Aqueduct
• Côte d'Azur Observatory
• Diocese of Oca (Asia Minor)
• Iruña de Oca
• Liquid optically clear adhesive
• OCA1
• Oakland Charter Academy
• Oca (river)
• Oca (structure)
• Oculocutaneous albinism
• Odisha Cricket Association
• Odoo
• Odoo Community Association
• Offensive counter air
• Office of Consumer Affairs (Canada)
• Olympic Council of Asia
• Open College of the Arts
• Open Content Alliance
• Open Control Architecture
• Open coloring axiom
• Operation Crossroads Africa
• Optical clearing agent
• Optimum currency area
• Oracle Certification Program
• Orange County Airport
• Orange County Astronomers
• Oregon Citizens Alliance
• Oregon Coast Aquarium
• Organic Consumers Association
• Organised and Financial Crime Agency of New Zealand
• Organization of Chinese Americans
• Organized Crime Agency of British Columbia
• Orthodox Church in America
• Outback Communities Authority
• Oxalis tuberosa
• Oxford Capacity Analysis
• Oxford Conservative Association
• Villafranca Montes de Oca