HMS Launceston Castle (K397) was a Castle-class corvette of the United Kingdom's Royal Navy, named after Launceston Castle in Cornwall.
She was launched by Blyth Shipbuilding and Drydock Company at Blyth in Northumberland on 27 November 1943.
In World War II she served as a convoy escort. In World War II she served in 30th Escort Group commanded by Denys Rayner RNVR carrying his flag on board HMS Pevensey Castle. HMS Launceston Castle under the command of Lieut. R.M.Roberts, DSC, RNVR, she was the escort member who actually sunk U-1200 south of Ireland on 11 November 1944, supported by her sister ships Pevensey Castle, Kenilworth Castle and Portchester Castle.
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Castle-class corvettes
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| Royal Navy |
- Allington Castle
- Alnwick Castle
- Amberley Castle
- Bamborough Castle
- Barnard Castle
- Berkeley Castle
- Caistor Castle
- Carisbrooke Castle
- Denbigh Castle
- Dumbarton Castle
- Farnham Castle
- Flint Castle
- Guildford Castle
- Hedingham Castle (K491)
- Hedingham Castle (K529)
- Hadleigh Castle
- Hever Castle
- Hurst Castle
- Kenilworth Castle
- Knaresborough Castle
- Lancaster Castle
- Launceston Castle
- Leaside Castle
- Leeds Castle
- Maiden Castle
- Morpeth Castle
- Norham Castle
- Nunnery Castle
- Oakham Castle
- Oxford Castle
- Pembroke Castle
- Pevensey Castle
- Portchester Castle
- Rayleigh Castle
- Rising Castle
- Rushen Castle
- Sandgate Castle
- Scarborough Castle
- Sherborne Castle
- Shrewsbury Castle
- Tamworth Castle
- Tintagel Castle
- Walmer Castle
- Wolvesey Castle
- York Castle
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| Royal Canadian Navy |
- Arnprior
- Bowmanville
- Copper Cliff
- Hespeler
- Humberstone
- Huntsville
- Kincardine
- Leaside
- Orangeville
- Petrolia
- St. Thomas
- Tillsonburg
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| Royal Norwegian Navy |
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