| OEC | Office of Energy Conservation | 能源保护局 |
| OEC | orthogonal electrocardiogram | 正交心电图 |
| OEC | Olfactory Ensheating Cell | 嗅觉感应单元 |
| OEC | Outdoor Education Center | 户外教育中心 |
| OEC | Ocean Energy Council | 海洋能源委员会 |
| OEC | Oxygen-Evolving System | 析氧系统 |
| OEC | Orange Empire Conference | 橙色帝国会议 |
| OEC | Outback Environmental Controls (Brisane, QLD, Australia) | 内陆环境控制（澳大利亚昆士兰州布里森） |
| OEC | Ocussi, Indonesia | 印度尼西亚奥库西 |
| OEC | Office of Environmental Coordination (New York, NY) | 环境协调办公室（纽约州纽约市） |
| OEC | Open Energy Corporation | 开放能源公司 |
| OEC | Offshore Engineered Components | 海上工程部件 |
| OEC | Oil Exploration Company (Iraq) | 石油勘探公司（伊拉克） |
| OEC | Offshore Engineered Component | 海上工程组件 |
| OEC | Oxygen Evolving Complex (photosynthesis) | 析氧复合物（光合作用） |
| OEC | Opus Embedded Command | Opus嵌入式命令 |
| OEC | Old Earth Creationism | 旧地球创造论 |
| OEC | Odd Engineering Contraption | 奇数工程合同 |
| OEC | Office Equipment Company of Mobile | 移动办公设备公司 |
| OEC | Ouachita Enterprise Community | Ouachita企业社区 |
| OEC | Ontario Engineering Competition | 安大略省工程竞赛 |
| OEC | Ocean Engineering Centre, Canada | 加拿大海洋工程中心 |
| OEC | Oregon Employer Council | 俄勒冈州雇主委员会 |
| OEC | Ormat Energy Converter | Ormat能量转换器 |
| OEC | Oklahoma Electric Cooperative, Inc. (Norman, OK) | 俄克拉荷马州电力合作社（俄克拉何马州诺曼） |
| OEC | Other Exchange Company | 其他交易所公司 |
| OEC | Operational Evaluation Command | 作战鉴定司令部 |
| OEC | overall evaluation criteria | 总体评价标准 |
| OEC | Outdoor Emergency Care | 户外急救 |
| OEC | Oxygen Equilibrium Curve | 氧气平衡曲线 |
| OEC | Otis Elevator Company | 奥的斯电梯公司 |
| OEC | Original Equipment Cost | 原始设备成本 |
| OEC | Operations Engineering Center | 运营工程中心 |
| OEC | Operational Employment Concept | 作战使用方案 |
| OEC | Office of Emergency Communications | 应急通信办公室 |
| OEC | Overseas Employment Corporation (Pakistan) | 海外就业公司（巴基斯坦） |
| OEC | Olfactory Ensheathing Cell | 嗅鞘细胞 |
| OEC | Operations and Engineering Contractor | 运营和工程承包商 |
| OEC | Ohio Environmental Council | 俄亥俄州环境委员会 |