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Killay South Ward
Area	1.24 km2 (0.48 sq mi)
Population	2,239 (2011 census)
• Density	1,806/km2 (4,680/sq mi)
Principal area	Swansea
Preserved county	West Glamorgan
Country	Wales
Sovereign state	United Kingdom
UK Parliament	Swansea West
Senedd Cymru – Welsh Parliament	Swansea West
Councillors	Jeffrey William Jones (Liberal Democrats (UK))
List of places UK Wales Swansea

Killay South (Welsh: Cilâ - De) was an electoral ward in the City and County of Swansea, Wales. The ward was mainly rural and consisted of some or all of the following areas: Dunvant, Ilston, Killay, Sketty and Upper Killay in the parliamentary constituency of Swansea West.

It was bounded by the wards of Dunvant and Killay North to the north; Sketty to the east; Mayals to the south; and Fairwood to the west.

For the 2012 local council elections, the turnout for Killay south was 43.73%. The results were:

51°37′06″N 4°01′25″W / 51.61836°N 4.02360°W / 51.61836; -4.02360