This is an accounting of the naval trawlers, purpose built or requisitioned, operated by the Royal Navy mainly during World War I and World War II. Vessels purpose built to Admiralty specifications for RN use were known as Admiralty trawlers. All trawlers operated by RN, regardless of origin, were typically given the prefix HMT, which stood for "His Majesty's Trawler".
Requisitioned trawlers
There were also 215 trawlers of no specific class These were commercial trawlers taken over by the Admiralty. The Royal Navy classified requisitioned trawlers by manufacturer, although such classes were more diverse than traditional naval classifications. Seventy-two requisitioned trawlers were lost.
References
Trawlers of the Royal Navy Wikipedia(Text) CC BY-SA