| LTSA | Long Term Service Agreement | 长期服务协议 |
| LTSA | Learning Technology Systems Architecture | 学习技术系统架构 |
| LTSA | Low Temperature Starting Aid (Advanced Engine Technology Ltd.) | 低温起动辅助装置（Advanced Engine Technology Ltd.） |
| LTSA | Long-Term Spectral Average | 长期光谱平均值 |
| LTSA | Labeled Transition System Analyzer | 贴标过渡系统分析仪 |
| LTSA | Land Transport Safety Authority (New Zealand) | 陆地运输安全局（新西兰） |
| LTSA | Linearly Tapered Slot Antenna | 线性锥形缝隙天线 |
| LTSA | Long-Term Space Astrophysics | 长期空间天体物理学 |
| LTSA | Land Transport Safety Authority | 陆路运输安全局 |
| LTSA | Land Title and Survey Authority | 土地所有权和测量局 |
| LTSA | Long-Term Service Agreement | 长期服务协议 |