| OCA | Oak Creek Apartments 
| Others |
| OCA | Object Complement Adjective
| Others |
| OCA | Object Content Architecture
| Others |
| OCA | Object of Competitor Analysis
| Others |
| OCA | Observability Co-distribution Algorithm
| Others |
| OCA | Obstacle Clearance Altitude
| Others |
| OCA | Occupational Chaplains of America
| Others |
| OCA | Ocean Reef Club, Florida USA
| Others |
| OCA | Oceanic Control Area
| Others |
| OCA | Oculocutaneous Albinism
| Others |
| OCA | Odoo Community Association
| Others |
| OCA | Off Campus Access
| Others |
| OCA | Off Campus Advisor
| Others |
| OCA | Off-Hook Call Announce
| Others |
| OCA | Offensive Counter Air
| Others |
| OCA | Offensive Counterair
| Others |
| OCA | Office of Congressional Affairs
| Others |
| OCA | Office of Consumer Advocate
| Others |
| OCA | Office of Consumer Affairs
| Others |
| OCA | Office of Court Administration
| Others |
| OCA | Office of Cultural Affairs
| Others |
| OCA | Office of Customer Advocacy
| Others |
| OCA | Office of the Chief Accountant
| Others |
| OCA | Office of the Child Advocate
| Others |
| OCA | Office of the City Administrator
| Others |
| OCA | Offsite Consequence Analysis
| Others |
| OCA | Ohio Cichlid Association
| Others |
| OCA | Ohio Collectors Association
| Others |
| OCA | Ohio Connections Academy
| Others |
| OCA | Ohio Contractors Association
| Others |
| OCA | Ohio Counseling Association
| Others |
| OCA | Oil Condition Algorithm
| Others |
| OCA | Oklahoma Cattlemens Association
| Others |
| OCA | Oklahoma Christian Academy
| Others |
| OCA | Oklahoma Coaches Association
| Others |
| OCA | Oklahoma Counseling Association
| Others |
| OCA | Old Cars Association
| Others |
| OCA | Oldsmobile Club of America
| Others |
| OCA | Oldsmobile Club of Arizona
| Others |
| OCA | Oldsmobile Club of Australia
| Others |
| OCA | Olympic Cascade Aquatics
| Others |
| OCA | Olympic Council of Asia
| Others |
| OCA | One Cancels All
| Others |
| OCA | One Click Action
| Others |
| OCA | Online Car Auction
| Others |
| OCA | Online Crash Analysis
| Others |
| OCA | Ontario Camping Association
| Others |
| OCA | Ontario Carbon Allowance
| Others |
| OCA | Ontario Cattlemen's Association
| Others |
| OCA | Ontario Classical Association
| Others |
| OCA | Ontario Cycling Association
| Others |
| OCA | Open Charge Alliance
| Others |
| OCA | Open Checking Account
| Others |
| OCA | Open Client Adapter
| Others |
| OCA | Open Coloring Axiom
| Others |
| OCA | Open Communities Alliance
| Others |
| OCA | Open Content Alliance
| Others |
| OCA | Open Control Architecture
| Others |
| OCA | Open Systems City Association
| Others |
| OCA | Operational Control Authority
| Others |
| OCA | Opportunities for Community Alliances
| Others |
| OCA | Opportunity Community Ability
| Others |
| OCA | Optically Clear Adhesive
| Others |
| OCA | Optimum Chainring Angle
| Others |
| OCA | Oracle Certificate Authority
| Others |
| OCA | Oracle Certified Administrator
| Others |
| OCA | Oracle certified Associate
| Others |
| OCA | Oracle Contributor Agreement
| Others |
| OCA | Orange County Astronomers
| Others |
| OCA | Oregon Cattlemen's Association
| Others |
| OCA | Oregon Center for the Arts
| Others |
| OCA | Oregon Chiropractic Association
| Others |
| OCA | Organic Consumers Association
| Others |
| OCA | Organic Cotton Accelerator
| Others |
| OCA | Organisation Classification and Association
| Others |
| OCA | Organization of
| Others |
| OCA | Organization of Chinese Americans
| Others |
| OCA | Originating Case Agency
| Others |
| OCA | Originating Case Agency Number
| Others |
| OCA | Orthodox Church in
| Others |
| OCA | Orthodox Church in America
| Others |
| OCA | Ostomy Care Associate
| Others |
| OCA | Ottawa Construction Association
| Others |
| OCA | Our Common Aim
| Others |
| OCA | Outstate Calling Area
| Others |
| OCA | Over Clocker's Addiction
| Others |
| OCA | Overhead Cost Allocation
| Others |
| OCA | Oxford Capacity Analysis
| Others |
| OCA | The Open Coloring Axiom
| Others |