Westcliff-on-Sea (often abbreviated to Westcliff, and in the past spelt as Westcliffe-on-Sea[2][3]) is a suburb of the city of Southend-on-Sea, located within the ceremonial county of Essex, England.

[a] The cliffs formed by erosion of the local quaternary geology give views over the Thames Estuary towards the Kent coastline to the south.

At low tide, the water typically retreats some 600 m from the beach, leaving the mud flats exposed.

[11] Westcliff-on-Sea is covered by several wards under Southend-on-Sea City Council, including some that fall outside of the designated area of Westcliff.

Several areas of Westcliff have been classified as conservation areas: Clifftown bordering Southend town centre and including Prittlewell Square gardens, Shorefield and the Leas towards the sea front, and Milton focused on the Park Estate between Park Street and Milton Road.

[20] Westcliff Library, designed by Patrick Burridge, the councils architect in 1956, built on a site damaged by bombing in World War II.

Further plans have been put forward by Southend-on-Sea City Council to pedestrianise half of the street,[26] while the local historical organisation, the Milton Society is campaigning to regenerate the road on the lines of Margate and the Cathedral Quarter in Derby.

Westcliff RFC currently play in National League 2 East, the fourth tier of the English rugby union system.