| AO | Automated Office | 自动化办公室 |
| AO | Among Others | 除了别的以外,其中 |
| AO | Accommodation Officer | [英](学校)宿舍管理员 |
| AO | Angola | 安哥拉 |
| AO | acridine orange | 吖啶橙 |
| AO | Analog Output | 模拟输出 |
| AO | abdominal aorta | 腹主动脉 |
| AO | absortion ointment | 吸水软膏剂 |
| AO | acid output | 酸排出量 |
| AO | Atlantic Ocean | 大西洋 |
| AO | Arctic Ocean | 北极海, 北冰洋 |
| AO | Adults Only | (WIN)只允许成年人 |
| AO | Anti-Oxidant | 抗氧化剂，硬化防止剂 |
| AO | Applied Optics | 应用光学 |
| AO | Audit Office | 进款检查室 |
| AO | Access Opening | 检修孔, 人孔 |
| AO | Access Ordering | (WIN)访问顺序 |
| AO | Application Objects | 应用对象 |
| AO | Application Original | 应用始发 |
| AO | Australian Airlines (IATA airline code) | 澳大利亚航空公司（IATA航空公司代码） |
| AO | Association Orukutuku | Orukutuku协会 |
| AO | Active Optical | 有源光学器件 |
| AO | Attack Objective | 攻击目标 |
| AO | Airdrome Officer | 机场值班军官 |
| AO | Atlanto-Occipital (joint) | 寰枕（关节） |
| AO | Adaptive Onestep (IEEE) | 自适应单步（IEEE） |
| AO | Account Owner | 帐户所有者 |
| AO | Ambleside Online (homeschool curriculum) | Ambleside Online（家庭学校课程） |
| AO | Associated Object | 关联的对象 |
| AO | Officer of the Order of Australia | 澳大利亚骑士团官员 |
| AO | Aaron Owens (streetball player) | 阿伦·欧文斯（街球运动员） |
| AO | Aosta (Val d'Aosta, Italy) | Aosta瓦尔d 'Aosta(意大利) |
| AO | Office of the Administrator | 署长办公室 |
| AO | Administrative Office/ Officer | 行政办公/军官 |
| AO | Atmosphere-Ocean | 大气海洋 |
| AO | Announcement of Opportunity | 机会的宣布 |
| AO | Auxiliary Operator (nuclear industry) | 辅助操作员（核工业） |
| AO | Aeronautical Orders (orders authorizing a military person to perform duties in flight) | 航空命令（授权军人执行飞行任务的命令） |
| AO | Acquisition Objective | 收购目标 |
| AO | Action Oriented | 以行动为导向 |
| AO | Area of Operation(s) | 操作区域 |
| AO | Anarchy Online (internet game) | 无政府在线（网络游戏） |
| AO | Aerosol Obscurant | 气溶胶遮蔽物 |
| AO | Abgabenordnung (German tax regulations) | Abgabenordnung（德国税务法规） |
| AO | Associate Post Office (also called associate office) | 联合邮局（也称为联合办公室） |
| AO | Accompanying Object | 伴随对象 |
| AO | Afrique Orientale (German East Africa) | 东方非洲（德语东非） |
| AO | AntiOnline (computer security website) | AntiOnline（计算机安全网站） |
| AO | ACCS (Army Command and Control System) OSI (Operator System Interface) | 陆军指挥控制系统OSI（操作员系统接口） |
| AO | Annotated Outline | 带注释的大纲 |
| AO | Accredited Organization | 认证机构 |
| AO | Acronym Overload | 首字母缩略词重载 |
| AO | Atomic Orbital | 原子轨道 |
| AO | Adaptive Optics | 自适应光学系统 |
| AO | Arctic Oscillation | 北极振荡 |
| AO | Aerial Observer | 空中观察员 |
| AO | Air Observer | 空中观察员 |
| AO | Aviation Officer | 航空官员 |
| AO | Aircraft Operator | 飞机操作员 |
| AO | Alexander Ovechkin (hockey player) | 亚历山大·奥维奇金（曲棍球运动员） |
| AO | Other Articles (US postal service) | 其他物品（美国邮政服务） |
| AO | Accounts Office | 会计办公室 |
| AO | Adults Only (ESRB game rating, 18 yrs. and up; graphic sex/violence) | 成年人(ESRB游戏评级,18 yrs.和图形性/暴力) |
| AO | Authorized Outage | 授权停机 |
| AO | Automated Operations | 自动化操作 |
| AO | Abort Output (TELNET protocol) | 中止输出（TELNET协议） |
| AO | Athlitikos Omilos (Greek: Athletic Club) | Athlitikos Omilos（希腊语：竞技俱乐部） |
| AO | Automags Online | 自动杂志在线 |
| AO | American Optical | 美国光学公司 |
| AO | Academy of Osseointegration | 学会 |
| AO | Atualidades OrnitolÓgicas (Ivaiporã-PR, Brazil) | Atualidades OrnitolÓgicas (Ivaiporã-PR, Brazil) |
| AO | Anglicans Online | 英国圣公会在线 |
| AO | Autonomous Okrug | 自治Okrug |
| AO | Appeals Office(r) | 上诉办公室（r） |
| AO | Argentum Online | Argentum在线 |
| AO | Alpha et Omega (epigraphy) | Alpha et Omega（金石学） |
| AO | Authorizing Official (for IMPAC Purchases) | 授权官员（IMPAC采购） |
| AO | Attendees Only | 仅限与会者 |
| AO | Anodal Opening | 阳极开口 |
| AO | Account Of | 帐户 |
| AO | Age Old | 老年人 |
| AO | Atelosteogenesis | 发育不全 |
| AO | Atomic Operation | 原子操作 |
| AO | aortic root | 主动脉根部 |
| AO | Air Operation | 空中作业 |
| AO | Assembly Order | 装配顺序 |
| AO | Advisory Opinion | 咨询意见 |
| AO | Amphibious Operation | 两栖作战 |
| AO | Abnormal Occurrence | 异常发生 |
| AO | Answers Only (educational testing) | 仅答案（教育测试） |
| AO | Administrative Order | 行政命令 |
| AO | Anarchy-Online (PC MMORPG) | 无政府在线（PC MMORPG） |
| AO | Apostolic Oblates | 使徒宣言 |
| AO | Assignment Officer | 派遣官员 |