| ITSA | Information Technology Student Association | 信息技术学生协会 |
| ITSA | International Travel Services Association | 国际旅行社协会 |
| ITSA | Intelligent Transportation Society of America | 美国智能交通协会 |
| ITSA | Interactive Travel Services Association | 互动旅游服务协会 |
| ITSA | International Transportation Safety Association | 国际运输安全协会 |
| ITSA | Inter Tribal Student Association | 部落间学生协会 |
| ITSA | Independent Tank Storage Association | 独立储罐协会 |
| ITSA | Instructional Technology Student Association | 教学技术学生协会 |
| ITSA | Interactive Tutor Self Assessment | 交互式导师自我评估 |
| ITSA | Information Technology Security Awareness | 信息技术安全意识 |
| ITSA | Information Technology Services Agency (UK government) | 信息技术服务局（英国政府） |
| ITSA | Information Technology Strategy & Architecture | 信息技术的策略和建筑 |
| ITSA | Insolvency and Trustee Service Australia | 澳大利亚破产和受托人服务 |
| ITSA | Information Technology Support Activity | 信息技术支持活动 |
| ITSA | Institute for Traffic Safety Analysis | 交通安全分析研究所 |
| ITSA | Institute for Telecommunications Sciences & Aeronomy | 电信科学研究所及Aeronomy |
| ITSA | Information Technology and Security Academy | 信息技术与安全学院 |
| ITSA | Independent Testing Service of Australia | 澳大利亚独立测试服务 |
| ITSA | Information Technology Support Associate | 信息技术支持助理 |
| ITSA | International Training and Simulation Alliance | 国际训练与模拟联盟 |
| ITSA | Iterative Two-Step Approach | 迭代两步法 |
| ITSA | Income Tax Self Assessment | 所得税自我评估 |
| ITSA | Information Technology Services Agency | 信息技术服务局 |