| PTO | Parent-Teacher Organization (variant of Parent-Teacher Association) | 家长教师组织（家长教师协会的变体） |
| PTO | Paid Time Off | 带薪休假 |
| PTO | Patent & Trademark Office | 专利与商标局 |
| PTO | Professional and Technology Officer | 专业技术干事 |
| PTO | Patent and Trademark Office | 专利商标局 |
| PTO | Personal Time Off | 个人休假时间 |
| PTO | Participating Test Organization | 参加的试验组织 |
| PTO | Prison Talk Online | 在线监狱谈话 |
| PTO | Permeability Tuned Oscillator | 磁导率调谐振荡器 |
| PTO | Programming and Training Officer | 规划和培训干事 |
| PTO | Pacific Theater of Operations | 太平洋战区 |
| PTO | Ping Time Out | Ping超时 |
| PTO | Preliminary Technical Order | 初步技术订单 |
| PTO | Permit to Operate | 经营许可证 |
| PTO | Pre-Trial Order | 预试订单 |
| PTO | Public Telecommunications Operator | 公共电信运营商 |
| PTO | Payment, Treatment or Operations (protected health information can only be shared for PTO purposes) | 付款、治疗或手术（受保护的健康信息只能用于PTO目的） |
| PTO | Presentation Text Object | 演示文稿文本对象 |
| PTO | Public Telephone Operator | 公共电话接线员 |
| PTO | Primary Test Organization | 主要测试组织 |
| PTO | Pallet Truck Operator | 托盘卡车操作员 |
| PTO | Planting Thought Organics (Los Angeles, California) | 种植思想有机物（加利福尼亚州洛杉矶） |
| PTO | Power Take Off | 动力输出装置 |
| PTO | pyrithione | 吡硫酮 |
| PTO | percutaneous transhepatic obliteration | 经皮肝穿刺闭塞术 |
| PTO | 2-pyridinethiol-1-oxide | 2-吡啶硫醇-1-氧化物 |
| PTO | Parent Teacher Organization | 家长教师组织 |
| PTO | Process Time Out | 进程超时 |
| PTO | Permission To Occupy | 占用许可证 |
| PTO | Please Take Off | 请起飞 |
| PTO | Patella Tracking Orthosis | 髌骨跟踪矫形器 |
| PTO | Payment Treatment and Operations | 付款处理和操作 |
| PTO | Pull Toyota Out | 拉出丰田汽车 |
| PTO | Please Talk Out | 请说出来 |
| PTO | Pre Trial Order | 预试订单 |
| PTO | Permanently Turned Off | 永久关闭 |
| PTO | Pretty Tractor Operator | 漂亮的拖拉机操作员 |
| PTO | Project Team and Organization | 项目团队和组织 |
| PTO | Pato Branco, PR, Brazil | Pato Branco，PR，巴西 |
| PTO | Power Take-Off | 动力输出装置 |
| PTO | Process Time Observation | 过程时间观察 |
| PTO | Powertrain Operations | 动力传动系统操作 |
| PTO | Pick to Order | 按订单选取 |
| PTO | Page Turn Over (musical term) | 翻页（音乐术语） |
| PTO | Percent Time Operable | 可操作时间百分比 |
| PTO | Public Tender Offer | 公开投标报价 |
| PTO | Professional Try-Out (professional sports) | 专业试用（专业运动） |
| PTO | Privilege Ticket Order (Indian Railways) | 特权票订单（印度铁路） |
| PTO | Prisoner Transfer Order (US Corrections) | 囚犯转移令（美国惩教署） |
| PTO | Post-Transient Operation | 瞬态后操作 |
| PTO | Pakistan Trade Office | 巴基斯坦贸易办公室 |
| PTO | Push to Operate | 按下操作按钮 |
| PTO | Prontuario Terapeutico Ospedaliero (Italy) | Prontuario Terapeutico Ospedaliero（意大利） |
| PTO | Peacetime Training Objective (US Air Force) | 和平训练目标（美国空军） |
| PTO | Poetry Today Online | 今日诗歌在线 |
| PTO | Power Transmission Overdrive | 动力传动超速 |
| PTO | Person Trade-Off | 人员权衡 |
| PTO | PÁtio (Portuguese postal usage) | PÁtio (Portuguese postal usage) |