Southend-on-Sea City Council is the local authority of the Southend-on-Sea district in Essex, England. It is a unitary authority, having the powers of a non-metropolitan county and district council combined. It is a member of the East of England Local Government Association. It is based at Southend Civic Centre in Southend-on-Sea.

Southend-on-Sea, commonly referred to as Southend, is a coastal city and unitary authority area with borough status in southeastern Essex, England. It lies on the north side of the Thames Estuary, 40 miles (64 km) east of central London. It is bordered to the north by Rochford and to the west by Castle Point. It is home to the longest pleasure pier in the world, Southend Pier. London Southend Airport is located north of the city centre.