HMS Southsea Castle was a 32-gun fifth rate built under contract by John Knowler of Redbridge (Southampton) in 1695/96.
She was the first vessel to bear the name Southsea Castle in the English and Royal Navy.
She was ordered on 3 May 1695 to be built under contract by John Knowler of Redbridge (Southampton). She was launched on 1 August 1696. Her dimensions were a gundeck of with a keel of for tonnage calculation with a breadth of and a depth of hold of . Her builder's measure tonnage was calculated as 373 tons (burthen).
The gun armament initially was four demi-culverins on the lower deck (LD) with two pair of guns per side. The upper deck (UD) battery would consist of between twenty and twenty-two 6-pounder guns with ten or eleven guns per side. The gun battery would be completed by four 4-pounder guns on the quarterdeck (QD) with two to three guns per side.
She was commissioned in 1696 under the command of Captain Samuel Whitaker. In 1697 she was under Commander Thomas Legge to sail with a Virginia bound convoy.
She was wrecked on the Dove Sands off Hoylake (Wirral) on 15 September 1697.