Eight ships of the Royal Navy have been named HMS Portland, either after Portland Harbour in Dorset or after holders of the title of the Duke of Portland:
- ^ Great Britain: Commissioners of Naval Enquiry (1803) The First (second-twelfth) Report of the Commissioners of Naval Enquiry, Appointed by Act 43 Geo. III. (Observations, by Way of Supplement, to the First Report of the Commissioners of Naval Enquiry, on the Memorial of the Principal Officers and Commissioners of His Majesty's Navy, in Answer to that Report.), p.116.