| PIO | Public Information Office | (美军)新闻处 |
| PIO | Public Information Officer | 新闻发布官 |
| PIO | Programmed Input Output | 可编程输入输出模式 |
| PIO | Process Input Output | 程序化输入输出 |
| PIO | Parallel Input/output | 并行输入／输出埠口 |
| PIO | Primaer Immunbrist Organisationen (Sweden) | 原始免疫组织（瑞典） |
| PIO | Primary Immunodeficiency Organization | 原发性免疫缺陷组织 |
| PIO | Private Input Output | 专用输入输出 |
| PIO | Principal Inspecting Officers (of Railways; United Kingdom) | 首席检查官（英国铁路部） |
| PIO | Pilot Involved Oscillation | 飞行员参与的振荡 |
| PIO | Programmed Input/Output | 程序的输入/输出 |
| PIO | Pilot Induced Oscillations | 飞行员引起的振动 |
| PIO | phenyl-imino-oxo-oxazolidine | 苯基亚氨基氧代恶唑烷 |
| PIO | Police Intelligence Operations | 警察情报行动 |
| PIO | Port Installed Option (automotive) | 端口安装选项（汽车） |
| PIO | Private Industrial Operator (energy market) | 私营工业运营商（能源市场） |
| PIO | Process Information Officers | 流程信息官 |
| PIO | Pesticide Information Office (University of Florida) | 农药信息办公室（佛罗里达大学） |
| PIO | Photographic Intelligence Officer | 摄影情报官 |
| PIO | Person of Indian Origin (card allows visa free entry to Indian origin people living abroad) | 印度裔人士（该卡允许居住在国外的印度裔人士免签证入境） |
| PIO | Parallel Input Output | 并行输入输出 |
| PIO | Pioneer Corporation of Japan | 日本先锋公司 |
| PIO | Paper In Oil | 纸在油中 |
| PIO | Pacific Islander Outreach | 太平洋岛民外联 |
| PIO | Protected Intending Occupier | 受保护的意图占用者 |
| PIO | Past Inputs and Outputs | 过去的输入和输出 |
| PIO | Personal Injury, Other (accident data) | 人身伤害，其他（事故数据） |
| PIO | Present Income Only | 仅当前收入 |
| PIO | Peruvian Inca Orchid (hairless dog breed) | 秘鲁印加兰花（无毛犬品种） |
| PIO | Project Integration Office | 项目集成办公室 |
| PIO | Pick It Out | 选择它 |
| PIO | Program Integration Office | 项目集成办公室 |
| PIO | Processor Input/Output | 输入/输出的处理器 |
| PIO | Bureau Public Information Officer | 局公共信息官 |
| PIO | Provisioned/Provisioning Item Order | 这些物品顺序。/设置 |
| PIO | Process Impact And Outcome | 过程影响和结果 |
| PIO | pemoline | 培莫林 |
| PIO | Port Installed Options | 端口安装选项 |
| PIO | Person Of Indian Origin | 印度人 |
| PIO | Public Information Office or Principle Investigating Officer | 公共信息办公室或首席调查官 |
| PIO | Pain In The Oopher | Oopher的痛苦 |
| PIO | Parrallel Input And Output | Parallel输入和输出 |
| PIO | Property Investment Options | 房地产投资选项 |
| PIO | Pisco, Peru | 秘鲁皮斯科 |
| PIO | Port Input Output | 端口输入输出 |
| PIO | Processor Input Output | 处理器输入输出 |