| RLSD | Research and Laboratory Services Division (United Kingdom) | 研究和实验室服务部（联合王国） |
| RLSD | Received Line Signal Detector | 接收线路信号检测器 |
| RLSD | Received Line Signal Detect (signal line) | 接收线路信号检测（信号线） |
| RLSD | Receive Line Signal Detect | 接收线信号检测 |
| RLSD | Research and Library Services Division | 研究和图书馆服务部 |
| RLSD | Richard Lee's Steel Decking | 理查德·李的钢桥面 |