Southbourne is a village and civil parish in the Chichester district of West Sussex, England.

It lies to the east of the Hampshire County Border at Emsworth, the west of Chidham (recently the boundary has been changed) and south-east of Westbourne.

Southbourne parish comprises Lumley, Hermitage, Thornham, Prinsted and part of Nutbourne.

The A259 road, formerly designated A27 and the main coast route until the construction of a new dual carriageway, runs through the village.

The village encompasses various residential areas and an industrial estate populated mainly with metal work outlets.

St John's Church was consecrated in May 1876 and has a western stained glass window dedicated to Nathaniel Frary Miller, American businessman and grandfather of author Agatha Christie.

[6] Other villages in the parish include: Slipper, Lumley, Hermitage, Thornham, Prinsted and part of Nutbourne.