The Bangor-class minesweepers were a class of warships operated by the Royal Navy (RN), Royal Canadian Navy (RCN), Imperial Japanese Navy (IJN), and Royal Indian Navy (RIN) during and after the Second World War. Some were later operated by the navies of Norway, Pakistan, Egypt, Portugal, Greece and Turkey, and several civilian operators.
The class derives its name from the lead ship, HMS Bangor, which was launched on 19 February 1940 and commissioned on 7 November of that year. Royal Navy ships were named after coastal towns of the United Kingdom.
Their lack of size gave vessels of the class poor sea handling abilities, reportedly worse even than the Flower-class corvettes. The diesel-engined versions were considered to have poorer handling characteristics than the slow-speed reciprocating-engined variants. Their shallow draught made them unstable and their short hulls tended to bury the bow when operating in a head sea.
The Bangor-class vessels were also considered overcrowded, cramming six officers and over 90 ratings into a vessel originally intended for a total of 40.