| Royal Naval Patrol Service | |
|---|---|
 The HMT Ailsa Craig, a minesweeping Isles-class trawler of the RNPS, 1944 | |
| Active | 1914–1919, 1939-1945 |
| Country |  United Kingdom |
| Branch |  Royal Navy |
The Royal Naval Patrol Service (RNPS) was a branch of the Royal Navy active during both the First and Second World Wars. The RNPS operated many small auxiliary vessels such as naval trawlers for anti-submarine and minesweeping operations to protect coastal Britain and convoys.