| Acronym | Definition |
|---|
| OSCAR | Osceola County Association of Realtors (Florida, USA) |
| OSCAR | Open Source Cluster Application Resources |
| OSCAR | Out of School Care and Recreation (New Zealand after-school program) |
| OSCAR | Orbiting Satellite Carrying Amateur Radio |
| OSCAR | Operational Stress Control and Readiness |
| OSCAR | On-Screen Configuration and Activity Reporting (Apex) |
| OSCAR | Open Standards for Container/Content Allowing Re-Use |
| OSCAR | Online System for Clerkship Application and Review |
| OSCAR | Open System for Communication in Realtime (AOL Instant Messenger) |
| OSCAR | Optical Storage Compressed Audio Replay |
| OSCAR | Open Systems Core Avionics Requirement |
| OSCAR | Outside Cable Rehabilitation |
| OSCAR | OFW Student Consulting and Research (Germany) |
| OSCAR | Offering Support to Children and Relatives (UK support group) |
| OSCAR | Optimised Expert System for Conducting Environmental Assessment of Urban Road Traffic |
| OSCAR | Online Student Computer Assisted Registration |
| OSCAR | Ordnance Survey Centre Alignment of Roads (UK) |
| OSCAR | Operational Software Components for Advanced Robotics |
| OSCAR | Online Services for Curriculum and Articulation Review (California) |
| OSCAR | Objective Supply Capability Adaptive Redesign |
| OSCAR | Occupation and Skill Computer-Assisted Researcher |
| OSCAR | Optical Submarine Communications By Aerospace Relay |
| OSCAR | Our Small Children At Risk Foundation |
| OSCAR | Online Support Center for Arcos |
| OSCAR | Outdoor Site Classification and Research |
| OSCAR | Operational Support Cost Accounting Report |
| OSCAR | Onsite Security Control and Audit Review |
| OSCAR | Optical Storage Collection and Retrieval |
| OSCAR | On-line Scanning And Retrieval (Filenet) |
| OSCAR | Online Survey and Certification and Reporting System (Centers for Medicare and Medicaid Services; US DHHS) |
| OSCAR | Outstanding Students of the Cordillera Administrative Region (Philippines) |