South Hornchurch is an electoral ward in the London Borough of Havering.

The ward has existed since the creation of the borough on 1 April 1965 and was first used in the 1964 elections.

It returns councillors to Havering London Borough Council.

The 1965, 1978 and 2002 versions of the ward covered a large area of southern Hornchurch extending northwards from the River Thames, including the industrialised Hornchurch Marshes area.

Territory was gained in the northeast from the abolished Airfield ward and some territory was transferred to Elm Park ward in the northwest.

[5] The by-election took place on 3 July 2008, following the death of Leonard Long.

[13] The ward established in 1965 covered the area from the southern boundary of the Elm Park estate the River Thames including the Hornchurch Marshes and most of South Hornchurch, with some eastern sections in Rainham ward.