| PEO | Polyethylene Oxide | 聚氧化乙烯 |
| PEO | Professional Engineers Ontario | 安大略省专业工程师协会 |
| PEO | Professional Engineers of Oregon | 俄勒冈州专业工程师 |
| PEO | Primer Estado Oculto (Spanish: Hidden First State; cryptographic protocol) | 初级Estado Oculto（西班牙语：隐藏的第一状态；密码协议） |
| PEO | Pan-Cyprian Labor Federation (Cyprus) | 泛塞浦路斯劳工联合会（塞浦路斯） |
| PEO | Performing Engineering Operations (UK) | 执行工程运营（英国） |
| PEO | Professional Employer Organization | 专业雇主组织 |
| PEO | Plant Equipment Operator | 工厂设备操作员 |
| PEO | Philanthropic and Educational Organization for Women (PEO International) | 妇女慈善和教育组织（PEO国际） |
| PEO | Program Enrichment Office | 项目拓展办公室 |
| PEO | Pacific Economic Outlook | 太平洋经济展望 |
| PEO | Polar Earth Orbit | 极地地球轨道 |
| PEO | Pre-Existing Ordering | 预先存在的订购 |
| PEO | Physical Education Officer (UK) | 体育官员（英国） |
| PEO | Personnel Executive Officer | 人事执行官 |
| PEO | Project Executive Office/Officer | 项目执行办公室/军官 |
| PEO | Program Evaluation Office/Officer | 项目评估办公室/军官 |
| PEO | Promoting Educational Opportunities | 促进教育机会 |
| PEO | Product Engineering Organization | 产品工程组织 |
| PEO | Product Engineering Office/Officer | 产品工程办公室/军官 |
| PEO | Primer Estado Oculto | Estado Oculto底漆 |
| PEO | Performing Engineering Operations | 执行工程操作 |
| PEO | Program Executive Office/Officer | 项目执行办公室/军官 |
| PEO | Petroleum & Resource Fund | 石油和资源的基金 |
| PEO | progressive external ophthalmoplegia | 进行性外眼肌麻痹 |
| PEO | phospho-enol-oxaloacetic acid | 磷酸烯醇草酰乙酸 |
| PEO | Program Executive Officer | 项目执行官 |
| PEO | Program Executive Office | 项目执行办公室 |
| PEO | Publish Everything Online | 在线发布所有内容 |
| PEO | Philanthropic Educational Organization | 慈善教育组织 |
| PEO | Peace Enforcement Operation (includes peace keeping operations) | 和平执行行动（包括维持和平行动） |
| PEO | Planning Engineers Organisation | 规划工程师组织 |
| PEO | Philanthropic Educational Organizantion | 慈善教育组织 |
| PEO | Plant Exchange Office | 工厂交换办公室 |
| PEO | Protect Each Other | 相互保护 |
| PEO | Personal Entertainment Organizer | 个人娱乐组织者 |
| PEO | Pay Equity Office (Canada) | 薪酬公平办公室（加拿大） |
| PEO | Professional Employee Organization | 专业员工组织 |
| PEO | Pentagon Engineering Office/Officer | 五角大楼的工程办公室/军官 |
| PEO | Persian, Old (ca. 600 - 400 B. C.) | 波斯语，古（约公元前600-400年） |
| PEO | Professional Employment Organization | 专业就业组织 |
| PEO | Papa Eats Out | 爸爸在外面吃饭 |