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HMS Loch Ruthven was a Loch-class frigate frigate of the British Royal Navy. The ship was named after Loch Ruthven in Scotland.

The ship was ordered from Charles Hill, Bristol, England on 25 January 1943, and laid down on 4 January 1944. Launched on 3 June 1944, and completed on 6 October 1944, the ship was commissioned soon after.

World War II
Attached to the 2nd Escort Group, based at Liverpool, from 27 October 1944, until May 1945 the ship patrolled the waters off Scotland and Northern Ireland,in the North-West approaches. She was sent to the English Channel in early1945 for convoy duties based at Plymouth. Whilst escorting convoy BTC 81 from Milford Haven on 26 February, she and her fellow escorts attacked and sank U-327 and U-1018. The following month she also participated in the sinking of U-683. After V-E Day the ship was nominated for service in East Indies. She was sent for refit at her builders on 5 May 1945, After modifications, including the fitting of additional 20mm AA guns, she sailed on 30 June for Ceylon, arriving on 23 July. In August she was set to take part in "Operation Zipper", the recapture of British Malaya, though this was cancelled after the surrender of Japan. She remained at Singapore, supporting local operations until returning to the UK in March 1946 to be decommissioned.

While in reserve in 1948 her pennant number was changed to F645.

Modernisation 1952-1953
Loch Ruthven remained in reserve until 1952, when she was brought forward for an extensive refit at Plymouth; along with eight of her sister ships, she was selected for modernisation as 2nd Rate Anti-Submarine Frigates and patrol vessels, to be mostly based in the Indian Ocean. This involved replacing the single 4" Mk V gun with a twin 4" Mk XVI mounting, removing the 20mm AA weapons and standardising the light AA on four single 40mm Bofors Mark IX, in the bridge wings and on each side of the funnel, and a twin 40mm Bofors Mk V aft. The twin squid AS Mortars were retained, however the depth charge rails were removed. The Type 277 Height height-finder radar aerial was replaced by a Type 277Q.

Post-War Service 1953-1963
She was recommissioned on 24 April 1953 and took part in the Coronation Review, representing the 3rd Flotilla. before continuing her commission with the training squadron at Londonderry.

Disposal and Scrapping
Placed on the Disposal List in May 1963 she remained at Devonport until 1966 when she was towed the short distance to Plymouth for scrap in November 1966.