HMS Portland is a Type 23 frigate of the British Royal Navy. She is the eighth ship to bear the name and is the fifteenth and penultimate ship of the 'Duke' class of frigates, and is named for the currently extinct title of the Dukedom of Portland, and more particularly for the third Duke, who was Prime Minister.

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.