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, , 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 s. 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.

Design and development The original intent of the Bangor-class minesweeper design was to provide a coastal equivalent of the ; the realities brought to light by the start of the war caused a modification of the design before construction started. The need for quick construction coupled with the lack of engineering resources resulted in several variations existing based on the availability of propulsion machinery. The ships all had twin screws but the machinery was a mix of steam turbine, slow-speed steam reciprocating, high-speed steam reciprocating and diesel. The diesel powered examples were about shorter than the rest as they had no need for boiler rooms. Displacement varied with propulsion machinery from 590 to 672 tons. The reciprocating engine powered Bangors were also known as the Blyth class and the steam turbine powered versions as the Ardrossan class. The class was considered cramped for the purposes it was built for, with not enough room provided for the acoustic and magnetic minesweeping gear carried.

Ships in class

Diesel-engined + Royal Navy Ship Pennant Builder Laid down Launched Commissioned Paid off Fate J00 Harland & Wolff, Belfast 19 Sep 1939 23 May 1940 7 Nov 1940 1945 Sold to Norway as Glomma in 1946, stricken in 1961 J27 Harland & Wolff, Belfast 19 Sep 1940 4 Jul 1940 3 Feb 1941 1945 Sold to Norway as Tarna in 1946, stricken in 1961 J65 William Denny and Brothers, Dumbarton 11 Sep 1939 29 Feb 1940 28 Sep 1940 Transferred to the Royal Air Force (RAF) in 1946. Sold for scrap at Plymouth on 6 May 1958. J50 William Denny and Brothers 11 Sep 1939 29 Feb 1940 28 Nov 1940 1945 Sold in 1946, scrapped at Plymouth on 6 May 1948

+ Royal Canadian Navy Ship Original pennant Builder Laid down Launched Commissioned Paid off Fate J270 Marine Industries Limited, Sorel 9 Dec 1940 20 Jun 1941 19 Sep 1942 28 Aug 1945 Transferred to the RCMP as the patrol vessel MacLeod in 1945. Transferred back to the RCN in 1951 and decommissioned in 1958. Sold to J.A.L. Steamships, Wallaceburg in 1961 and scrapped. J267 Davie Shipbuilding, Lauzon 20 Mar 1941 5 Jun 1942 26 Jul 1942 31 Jul 1945 Transferred to the RCMP as the patrol vessel Perry in 1945. Transferred back to the RCN in 1953 and decommissioned in 1958. J272 Marine Industries Limited; Sorel, Quebec 20 Dec 1940 8 Aug 1941 26 Oct 1942 16 Apr 1945 Torpedoed and sunk on 16 Apr 1945 by off Chebucto Head at . 44 crew lost, 26 survived. J264 Davie Shipbuilding, Lauzon 17 Dec 1940 6 Sep 1941 2 May 1942 31 Jul 1945 Recommissioned by the RCN in 1953 and decommissioned in 1966 J266 Davie Shipbuilding, Lauzon 27 Dec 1940 14 Jun 1941 20 Jun 1942 31 Jul 1945 Rebuilt as a rescue ship in 1945, transferred to the RCMP as the patrol vessel Starnes in 1950. Sold as the mercantile vessel Jack's Bay in 1952. J263 Davie Shipbuilding, Lauzon 17 Dec 1940 6 Jul 1941 4 Dec 1941 18 Aug 1945 Transferred to the RCMP as the patrol vessel Cygnus in 1945. Scrapped in 1961. J265 Davie Shipbuilding, Lauzon 27 Dec 1940 13 Jun 1941 15 May 1942 28 Aug 1945 Transferred to the RCMP as the patrol vessel Irvine in 1945. Sold in 1962 and became the yacht Miranda. Foundered in Montego Bay in 1972 and was scrapped. J271 Marine Industries Limited; Sorel, Quebec 18 Dec 1940 26 Apr 1941 25 Nov 1942 31 Jul 1945 Transferred to the RCMP as the patrol vessel French in 1945. Scrapped in 1961. J269 Davie Shipbuilding, Lauzon 9 Dec 1940 30 Jun 1941 8 Dec 1942 31 Jul 1945 Transferred to the RCMP as the patrol vessel MacBrien in 1945. Scrapped in 1959. J268 Davie Shipbuilding, Lauzon 20 Mar 1941 5 Jun 1942 27 Aug 1942 31 Jul 1945 Transferred to the RCMP as the patrol vessel Herchmer in 1945. Sold as the mercantile vessel Gulf Mariner; scrapped in 1964.

Turbine-engined + Royal Navy Ship Pennant Builder Laid Down Launched Commissioned Paid Off Fate J131 Blyth Shipbuilding, Blyth 6 Sep 1940 22 Jul 1941 21 May 1942 Sold on 1 Jan 1948 and scrapped at Thornaby on 29 Aug 1948 J07 Ailsa Shipbuilding Company, Troon 31 Dec 1939 31 Oct 1940 28 Aug 1941 Sold on 1 Jan 1948 and scrapped at Milford Haven J143 Ailsa Shipbuilding Company, Troon 31 Aug 1940 23 Oct 1941 3 Apr 1942 Sold on 1 Jan 1948 and scrapped at Charlestown, Fife in June 1949 J14 Ailsa Shipbuilding Company, Troon 27 Nov 1939 30 Dec 1940 26 Jan 1942 Sold on 1 Jan 1948 and scrapped at Charlestown, Fife in June 1949 J105 Blyth Shipbuilding; Blyth, Northumberland 6 Nov 1940 21 Oct 1941 19 Aug 1942 Scrapped on 7 Jul 1948 at Dunston J151 Ailsa Shipbuilding Company, Troon 12 Nov 1940 19 Dec 1941 4 Jun 1942 31 Dec 1943 Struck a mine and sank east of Corsica on 31 Dec 1943. Three officers and 29 crew died. J09 Blyth Shipbuilding; Blyth, Northumberland 12 Jun 1940 24 Feb 1941 13 Dec 1941 23 Oct 1943 Struck a mine and sank in Strait of Bonifacio on 23 Oct 1943 J173 Ailsa Shipbuilding Company, Troon 13 Jan 1941 4 Feb 1942 22 Jul 1942 Sold on 1 Jan 1948. Scrapped at Thornaby. J53 Blyth Shipbuilding; Blyth, Northumberland 21 Jun 1940 5 Jun 1941 3 Mar 1942 Sold on 1 Jan 1948. Scrapped at Southampton. J182 Blyth Shipbuilding; Blyth, Northumberland 28 Jul 1941 11 May 1942 Never served in the Royal Navy. She was transferred to the Royal Indian Navy before completion to become . J155 Blyth Shipbuilding; Blyth, Northumberland 28 Oct 1941 14 Jul 1942 Never served in the Royal Navy. She was transferred to the Royal Indian Navy before completion to become . J190 William Hamilton and Company, Port Glasgow 10 Dec 1940 17 Feb 1942 Never served in the Royal Navy. She was transferred to the Royal Indian Navy before completion to become . J194 Ailsa Shipbuilding Company, Troon 20 Jul 1940 4 Sep 1941 5 Mar 1942 11 Oct 1943 Torpedoed and sunk by at 01:09 on 11 Oct 1943 off Bougie, Algeria at . J95 William Hamilton and Company, Port Glasgow 11 Oct 1939 29 Jan 1941 20 Aug 1941 Sold on 1 Jan 1948. Scrapped at Dunston. J67 William Hamilton and Company, Port Glasgow 20 Oct 1939 8 Nov 1941 29 Mar 1942 Sold in 1947 as the mercantile ship Rorvik. Scrapped in 1952. J193 Lobnitz & Co. 9 Sep 1941 19 Mar 1942 5 Jun 1942 Scrapped at Sunderland on 24 Aug 1948. J164 William Hamilton and Company 12 Dec 1940 2 May 1942 Never served in the Royal Navy. She was transferred to the Royal Indian Navy before completion to become . J199 William Hamilton and Company, Port Glasgow 28 Mar 1941 29 Jul 1942 Never served in the Royal Navy. She was transferred to the Royal Indian Navy before completion to become . J180 William Hamilton and Company, Port Glasgow 29 Aug 1941 29 Oct 1942 Never served in the Royal Navy. She was transferred to the Royal Indian Navy before completion to become . J97 Ailsa Shipbuilding Company, Troon 6 Nov 1939 18 Jul 1940 9 May 1940 Scrapped at Sunderland in June 1950 J147 Alexander Stephen and Sons 25 Jul 1940 25 Jun 1941 8 Nov 1941 Sold on 1 Jan 1948. Scrapped at Pembroke Dock. J19 William Hamilton and Company, Port Glasgow 29 Sep 1939 18 Mar 1941 3 Jul 1941 Sold on 19 Apr 1950. Scrapped at Milford Haven. J76 Ailsa Shipbuilding Company, Troon 27 Nov 1939 19 Aug 1940 20 Nov 1941 Sold on 24 Aug 1948. Scrapped at Purfleet in September 1948. J34 William Hamilton and Company, Port Glasgow 29 Sep 1939 10 Sep 1941 8 Dec 1941 Sold on 1 Jan 1948. Scrapped at Dunston. J121 Philip and Son, Dartmouth, Devon 24 Jul 1940 29 May 1941 14 Nov 1941 Sold on 14 Aug 1948. Scrapped at Briton Ferry. J72 Philip and Son; Dartmouth, Devon 15 Nov 1940 22 Aug 1941 20 Mar 1942 Sold on 7 Jul 1948. Scrapped at Dunston.

+Royal Indian Navy Ship Original pennant Builder Laid down Launched Commissioned Paid off Fate J182 Blyth Shipbuilding, Blyth 28 Jul 1941 11 May 1942 28 Oct 1942 Formerly , She was transferred to the RIN before completion. She was sold to Pakistan in 1947. Scrapped on 22 Jan 1959. J199 William Hamilton and Company, Port Glasgow 28 Mar 1941 29 Jul 1942 27 Oct 1942 Formerly , She was transferred to the RIN before completion. Scrapped in 1949. J155 Blyth Shipbuilding, Blyth, Northumberland 28 Oct 1941 14 Jul 1942 23 Dec 1942 Formerly , she was transferred to RIN before completion. She was sold to Pakistan in 1947 as Chittagong. Scrapped in 1956. J190 William Hamilton and Company, Port Glasgow 10 Dec 1940 17 Feb 1942 12 Aug 1942 Formerly , she was transferred to the RIN before completion. Scrapped in 1949. J164 William Hamilton and Company, Port Glasgow 12 Dec 1940 2 May 1942 30 Nov 1942 Formerly , she was transferred to the RIN before completion. Scrapped in 1949. J180 William Hamilton and Company, Port Glasgow 29 Aug 1941 29 Oct 1942 5 Feb 1943 Formerly , she was transferred to the RIN before completion. Scrapped in 1961.

Reciprocating-engined