| APO | Air Programs Office | 大气规划局[美] |
| APO | Asian Productivity Organization | 亚洲生产力组织 |
| APO | Apolipoprotein | 载脂蛋白 |
| APO | Army Post Office | (美国)陆军军邮局 |
| APO | Office of Aviation Policy and Plans | 航空政策和计划办公室 |
| APO | Ad Per Offer | 每次报价的广告 |
| APO | Advanced Planner Optimizer | 高级规划优化器 |
| APO | adriamycin,prednisone,oncovin | 阿霉素、强的松、溶瘤 |
| APO | Agency Procurement Officer | 机构采购干事 |
| APO | Advanced Planner and Optimizer | 高级计划优化器 |
| APO | Apprentice Police Officer | 见习警官 |
| APO | Automatic Payment Order | 自动付款单 |
| APO | Advanced Planning Optimizer | 高级规划优化器 |
| APO | African Political/People's Organisation | 非洲政治/人民团体 |
| APO | Apartado, Colombia | 阿帕塔多，哥伦比亚 |
| APO | Amateur Philatelists Organization | 业余集邮者组织 |
| APO | Atmospheric Potential Oxygen | 大气势氧 |
| APO | Automatic Power Off | 自动关闭电源 |
| APO | AWIPS Program Office | AWIPS项目办公室 |
| APO | ASAS ( All- Source Analysis System) Project Office | ASAS（全源分析系统）项目办公室 |
| APO | Administrative Policy Office | 行政政策办公室 |
| APO | Apollo Program Office | 阿波罗计划办公室 |
| APO | Alpha Phi Omega (fraternity) | Alpha Phi Omega（兄弟会） |
| APO | Arlington Philharmonic Orchestra (Arlington, MA) | 阿灵顿爱乐乐团（马萨诸塞州阿灵顿） |
| APO | Armenian Philharmonic Orchestra (Yerevan, Armenia) | 亚美尼亚爱乐乐团（亚美尼亚埃里温） |
| APO | Action Print Only | 仅动作打印 |
| APO | Ausserparlamentarische Opposition (Students' Movement in Germany in the late 1960's) | Ausserparlamentarische反对派(学生运动在1960年在德国的) |
| APO | Audit Policy and Oversight (US DoD IG) | 审计政策和监督（美国国防部IG） |
| APO | Annual Program Objective | 年度计划目标 |
| APO | Asset Placement Optimizer | 资产放置优化器 |
| APO | Audio Processing Object | 音频处理对象 |
| APO | Asia/Pacific Office | 亚太地区办事处 |
| APO | Anaesthesia Paramedical Officer | 麻醉辅助医生 |
| APO | FAA Aviation Policy and Plans Office | FAA航空政策和计划办公室 |
| APO | Austin Philharmonic Orchestra (Austin, TX) | 奥斯汀爱乐乐团（德克萨斯州奥斯汀） |
| APO | Auckland Philharmonia Orchestra | 奥克兰爱乐乐团 |
| APO | Alpha Phi Omega | 阿尔法Phi Omega |
| APO | aphoxide(triethylenephosphoramide) | 环氧乙烷（三乙基磷酰胺） |
| APO | adductor pollicis obliquus(muscle) | 拇斜收肌（肌肉） |
| APO | apomorphine | 阿扑吗啡 |
| APO | Apoplex | Apoplex公司 |
| APO | Ares Projects Office | Ares项目办公室 |
| APO | afloat pre-positioning operations (US DoD) | 海上预定位作战（美国国防部） |
| APO | Autopilot-Off (band) | 自动驾驶仪关闭（波段） |
| APO | Alternative Primatial Oversight | 替代首要监督 |
| APO | African Political Organization | 非洲政治组织 |
| APO | Optical Answer Print | 光学答案打印 |
| APO | Animal Protection Officer | 动物保护官员 |
| APO | Adaptive Planning Option | 自适应规划选项 |
| APO | Assemble Per Order | 按订单组装 |
| APO | Army Procurement Objective | 陆军采购目标 |
| APO | Automated Project Order Form System | 自动化项目订单系统 |
| APO | Aldworth Philharmonic Orchestra (UK) | 阿尔德沃思爱乐乐团（英国） |
| APO | Authorized Personnel Only (Alias TV show) | 仅限授权人员（Alias电视节目） |
| APO | Administrative Protective Order | 行政保护令 |
| APO | Australian Post Office | 澳大利亚邮政局 |
| APO | AWIPS Program Office (US DoD) | AWIPS项目办公室（美国国防部） |
| APO | Apochromatic (optics) | 消色差（光学） |
| APO | Atlanta Philharmonic Orchestra (Atlanta, Georgia) | 亚特兰大爱乐乐团（乔治亚州亚特兰大） |
| APO | Army & Air Force Post Office | 陆军和空军邮局 |
| APO | Air Post Office | 空军邮局 |
| APO | ALARA Program Office | ALARA项目办公室 |
| APO | Authorized Personnel Only | 闲人勿进 |
| APO | Advanced Planner and Optimizer (SAP software) | 高级规划器和优化器（SAP软件） |
| APO | Advanced Production Orders | 高级生产订单 |
| APO | Apache Point Observatory (Sunspot, New Mexico) | 阿帕契角天文台（新墨西哥州太阳黑子） |
| APO | African People's Organization | 非洲人民的组织 |
| APO | Application Platform Optimization (Microsoft) | 应用程序平台优化（Microsoft） |
| APO | Acquisition Project/Program Office(r) | 收购项目/项目办公室(r) |
| APO | Application Process Outsourcing | 应用程序流程外包 |
| APO | ASAS Project Office | ASAS项目办公室 |
| APO | Administrative Penalty Order | 行政处罚令 |
| APO | Accountable Property Officer | 财产官 |