| ATOP | Association of Tour Operators to Portugal | 葡萄牙旅游经营者协会 |
| ATOP | Alberta Teachers of Psychology | 阿尔伯塔省心理学教师 |
| ATOP | Advanced Technologies and Oceanic Procedures | 先进技术和海洋程序 |
| ATOP | Agents Training Operations Program | 代理商培训运营计划 |
| ATOP | Access to Opportunities Program (Canada) | 获得机会计划（加拿大） |
| ATOP | Airline Training Orientation Program | 航空公司培训定向计划 |
| ATOP | Automated Travel Order Process | 自动旅行订单流程 |