Cardiff South (UK Parliament constituency)

Cardiff South was a borough constituency in Cardiff, Wales. It returned one Member of Parliament to the House of Commons of the Parliament of the United Kingdom.

The constituency was created for the 1918 general election, and abolished for the 1950 general election. Its final MP was Labour's James Callaghan, elected in 1945 at the age of 33, who would go on to serve the party until 1987, including a spell as prime minister from 1976 to 1979 after several roles in the governments of Harold Wilson.