HMS Royal Adelaide was a 104-gun first-rate ship of the line of the Royal Navy, launched on 28 July 1828 at Plymouth. When first ordered in 1812 she was intended to be a second rate of 98 guns, but in the general reclassifications of 1817 she was reclassed as a first rate. By the time of the 1871 census she was the flagship at the Hamoaze, Devonport. She was converted to serve as a depot ship in 1860, and was eventually sold out of the navy in 1905.