Cardiff South may refer to:
Australia Cardiff South, New South Wales, a suburb of the City of Lake Macquarie, Australia South Cardiff FC, a soccer club based in Cardiff South, Newcastle, Australia
Wales Cardiff South (UK Parliament constituency), a former borough constituency (1918–1950) Cardiff South and Penarth (UK Parliament constituency), a constituency created in 1983 Cardiff South and Penarth (Senedd constituency), a former constituency (1999–2026) South (Cardiff electoral ward), a former electoral ward