HMS Alnwick Castle (K405)

HMS Alnwick Castle was a Castle-class corvette of the United Kingdom's Royal Navy. She was named after Alnwick Castle in Northumberland.

She was laid down on 12 June 1943 and launched by George Brown and Company at Greenock in Scotland on 23 May 1944. She was commissioned on 11 November 1944 and served as a convoy escort until the end of the Second World War.

After the war, she was placed in reserve at Portsmouth where she remained until she was transferred to the reserve at Harwich in 1950 and thence to West Hartlepool until 1958 when she was scrapped. She arrived at Gateshead for scrapping on 9 December 1958.