| ORCA | Ontario Recreational Canoeing Association | 安大略省休闲皮划艇协会 |
| ORCA | The Online Racing Championship Association | 在线赛车锦标赛协会 |
| ORCA | Ontario Residential Care Association | 安大略省住宅护理协会 |
| ORCA | Outdoor Recreation Coalition of America (trade association for outdoor recreation businesses and organizations) | 美国户外娱乐联盟（户外娱乐企业和组织的行业协会） |
| ORCA | Ocean Racing Catamaran Association | 海洋赛车双体船协会 |
| ORCA | Ohio Romanian Children's Association | 俄亥俄州罗马尼亚儿童协会 |
| ORCA | Organized Readers of Comics Associated | 漫画协会有组织的读者 |
| ORCA | Ontario Recreational Canoe Association | 安大略省休闲独木舟协会 |
| ORCA | Old Reel Collectors Association (fishing reel collectors) | 旧卷筒收藏家协会（钓鱼卷筒收藏家） |
| ORCA | Overarching Range Cooperative Agreement | 总体范围合作协议 |
| ORCA | One Regional Card for All (public transit, Puget Sound, Washington) | 所有人一张地区卡（公共交通，普吉特湾，华盛顿） |
| ORCA | Optical Relay Communications Architecture (US National Reconnaissance Office; now defunct) | 光学中继通信架构（美国国家侦察局；现已解散） |
| ORCA | Only Rendered Creations Accepted | 仅接受渲染的创作 |
| ORCA | Optical Rural Community Access | 光纤农村社区接入 |
| ORCA | Orca Technologies, Inc. | 奥卡科技公司。 |
| ORCA | Oceanic Research Centre Australia | 澳大利亚海洋研究中心 |
| ORCA | Open Repository Case Api | 开放存储库案例Api |
| ORCA | Open Resort Of Computer Applications | 计算机应用开放度假区 |
| ORCA | On-line Reporting and Charting Application | 在线报告和图表应用程序 |
| ORCA | Occupational Researcher's Computer Assistant | 职业人员的计算机辅助 |
| ORCA | Organized Red Cross Activities | 有组织的红十字活动 |
| ORCA | Office of Rural Community Affairs | 农村社区事务办公室 |
| ORCA | Overboard Recovery Communications Apparatus (BriarTek Inc.) | 舷外恢复通信设备（BriarTek Inc.） |
| ORCA | Optimized Robot for Chemical Analysis | 化学分析优化机器人 |
| ORCA | Ocean Resources Conservation and Assessment | 海洋资源保护与评估 |
| ORCA | Online Research Collections Australia | 澳大利亚在线研究收藏 |
| ORCA | Operations Research & Computational Analysis (Sandia National Laboratories) | 研究和计算分析(美国山迪亚国家实验室) |
| ORCA | Oregon Caves National Monument (US National Park Service) | 俄勒冈州洞穴国家纪念碑（美国国家公园管理局） |
| ORCA | Open, Reliable Communications Architecture | 开放、可靠的通信体系结构 |
| ORCA | Options ROM for Configuring Arrays (HP servers) | 用于配置阵列的选项ROM（HP服务器） |
| ORCA | Object-oriented Requirements Capture and Analysis | 面向对象的需求捕获和分析 |
| ORCA | Operational Requirement-Based Casualty Assessment | 基于作战需求的伤亡评估 |
| ORCA | Orca Relief Citizens' Alliance | 逆戟鲸救济公民联盟 |
| ORCA | Online Representations and Certifications Application | 在线陈述和认证申请 |