| OSCA | Oberlin Student Cooperative Association 
| Others |
| OSCA | Objective Structured Clinical Assessment
| Others |
| OSCA | Occupational Safety Councils of America
| Others |
| OSCA | Ocean Science Council of Australia
| Others |
| OSCA | Offboard Software Communication Assistant
| Others |
| OSCA | Office for Special Construction of Automobiles
| Others |
| OSCA | Office of Senior Citizen Affairs
| Others |
| OSCA | Office of State Courts Administrator
| Others |
| OSCA | Office of the State Court Administrator
| Others |
| OSCA | Officina Specializzata Costruzione Automobili
| Others |
| OSCA | Officina Specializzatta Construzione Automobili
| Others |
| OSCA | Officine Specializate Construzione Automobili
| Others |
| OSCA | Officine Specializate Costruzione Automobili
| Others |
| OSCA | Officine Specializzate Costrutzione Automobili
| Others |
| OSCA | Officine Specializzate Costruzione Automobili
| Others |
| OSCA | Officine Specializzate Costruzioni Automobili
| Others |
| OSCA | Ohio School Counselor Association
| Others |
| OSCA | Ohio State Chiropractic Association
| Others |
| OSCA | Ohio State Coroners' Association
| Others |
| OSCA | Oklahoma Songwriter`s and Composer`s Association
| Others |
| OSCA | Olin Strategy and Consulting Association
| Others |
| OSCA | Omaha Sister Cities Association
| Others |
| OSCA | On Screen Colour Adjustment
| Others |
| OSCA | On Shelf Customer Availability
| Others |
| OSCA | On-Site Communications Association
| Others |
| OSCA | Online Standardisation for Centre Assessment
| Others |
| OSCA | Ontario Street Car Association
| Others |
| OSCA | Open Saloon Car Association
| Others |
| OSCA | Open Space Conservation Area
| Others |
| OSCA | Open Stimulate Captivate Attract
| Others |
| OSCA | Open Systems Color Association
| Others |
| OSCA | Operations Systems Computing Architecture
| Others |
| OSCA | Optical Switching Components and Applications
| Others |
| OSCA | Oracle Startup Cloud Accelerator
| Others |
| OSCA | Orchestrating Single Cell Analysis
| Others |
| OSCA | Oregon School Counselor Association
| Others |
| OSCA | Organisation for Sports Club Administration, Ltd.
| Others |
| OSCA | Osteopathic Sports Care Association
| Others |
| OSCA | Outdoors Survival Challenge Adventure
| Others |
| OSCA | Outlaw Street Car Association
| Others |
| OSCA | Outreach Service for Children Adolescents
| Others |
| OSCA | Ovenden Sports and Community Arena
| Others |
| OSCA | Oxford Spires Creative Arts
| Others |