HMS Norfolk was a British Type 23 frigate, the sixth in the Royal Navy to use this name, laid down in 1985 by Yarrow Shipbuilders. She was launched on the Clyde by Princess Margaret, Countess of Snowdon in July 1987 and named for the Dukedom of Norfolk. She was commissioned on 1 June 1990. Norfolk was the 'first of class', as well as being the first of a new generation of 'lean manned' ships. She was commissioned into the Chilean Navy in 2006 as Almirante Cochrane.

The Type 23 frigate or Duke class is a class of frigates built for the United Kingdom's Royal Navy. The ships are named after British Dukes, thus leading to the class being commonly known as the Duke class. The first Type 23, HMS Norfolk, was commissioned in 1989, and the sixteenth, HMS St Albans was commissioned in June 2002. They form the core of the Royal Navy's destroyer and frigate fleet and serve alongside the Type 45 destroyers. They were designed for anti-submarine warfare, but have been used for a range of uses. Ten Type 23 frigates remain in service with the Royal Navy, with three vessels having been sold to the Chilean Navy, one being retired in 2021, and two being retired in 2023.