The fifth HMS Norfolk was laid down on 15 March 1966 by Swan Hunter and launched by Lavinia, Duchess of Norfolk in November 1967. She was commissioned in March 1970. Like her predecessor, she was a County-class warship, though this time she was a destroyer, rather than a cruiser, and her most potent armament was not her guns, but her missiles.
In 1972 Norfolk began a refit to replace 'B' turret with four Exocet launchers. She was thus the first Royal Navy warship to be armed with the Exocet missile system. She also became the first warship to carry three independent missile systems: Exocet, Sea Cat and Sea Slug. Norfolk recommissioned in 1974. She had a displacement of 5,450 tons and was quite a large ship, considering she was classified as a destroyer. She undertook numerous deployments to the Indian Ocean, Mediterranean Sea and South Pacific Ocean.
In September 1976, one of the highlights of her relatively peaceful career came, when she flew the Queen's Colour in Sweden and King Carl XVI Gustaf unveiled a plaque to commemorate the British Admiral James de Saumarez. During the ship's visit to Fremantle, Australia in 1979, she had an unwelcome milestone - she became the first warship afloat to hold a Court Martial in over 10 years. The visit itself was made to commemorate 150 years of the founding of Western Australia.
In September 1976, Norfolk took over the UK's commitment to Standing Naval Force Atlantic. She decommissioned in 1981 to become the Dartmouth Training Ship.
Norfolk was sold to Chile on 6 April 1982 and renamed Capitán Prat. In 1996, her Sea Cat launchers were removed and she was fitted with the Barak SAM. In 2001, her Sea Slug system was removed and she was refitted as a Helicopter Destroyer with a Cougar attack helicopter.
On 24 February 2006, Capitán Prat was laid up; she was decommissioned on 11 August 2006. In September 2008, she sailed to Mexico for scrap.