Naval trawlers were purpose-built or requisitioned and operated by the Royal Navy (RN), mainly during World Wars I and II.
Lobnitz Ferguson Goole Shipbuilders and others The trawler Viola, built in 1906 at Hull and requisitioned September 1914 is the oldest surviving steam trawler in the world.
She is currently beached at Grytviken in South Georgia, though there are plans to return her to Hull.
The Royal Navy classified requisitioned trawlers by manufacturer, although such classes were more diverse than traditional naval classifications.
Seventy-two requisitioned trawlers were lost.