南海城（Southsea）是英国汉普郡普茨茅斯的一处滨海疗养地。

1544年亨利八世在当地建造了一座城堡，当时这座城堡的名称不详，但是在1724年的一张地图上该城堡被标名为南海城堡。

1809年当地出现了一个居民点，并开始扩展。这个居民点以城堡命名为南海城。最早的建筑物是给有技巧的手工业者建造的。约1810年城市开始向海岸的方向发展。

到1835年南海城非常小。从1835年至1860年今天的中层阶层市区建成。

1857年市内设立了一位专职负责路面、清洁和照明的人。1860和1870年代里城市不断扩展。市内的建筑风格是典型的普茨茅斯地区的建筑风格。

Southsea is a seaside resort and geographic area, located in Portsmouth at the southern end of Portsea Island, Hampshire, England. Southsea is located to the south of Portsmouth city centre and to the east of Old Portsmouth. It originally developed as a Victorian seaside resort in the 19th century and grew into a dense residential suburb and large distinct commercial and entertainment area, separate from Portsmouth city centre itself. The name of the area originates from Southsea Castle; a fort, located on the seafront and constructed in 1544 to help defend the Solent and approaches to Portsmouth Harbour.