St Leonards-on-Sea is a town and seaside resort in the Borough of Hastings in East Sussex, England. It has been part of the borough since the late 19th century and lies to the west of central Hastings. The original part of the settlement was laid out in the early 19th century as a new town: a place of elegant houses designed for the well-off; it also included a central public garden, a hotel, an archery, assembly rooms and a church. Today's St Leonards has extended well beyond that original design, although the original town still exists within it.

St Leonards Warrior Square railway station is on the Hastings line in the south of England and is one of four stations that serve Hastings, East Sussex. It is 61 miles 55 chains (99.3 km) down the line from London Charing Cross. The station is operated by Southeastern but is also served by trains operated by Southern.