South Wexford was a UK Parliament constituency in Ireland, returning one Member of Parliament from 1885 to 1922.

Prior to 1885 the area was part of the County Wexford constituency. From 1922, on the establishment of the Irish Free State, the area was not represented in the UK Parliament.

This constituency was created under the Redistribution of Seats Act 1885 and comprised the southern part of County Wexford. Under the Redistribution of Seats (Ireland) Act 1918, the boundary was expanded to include the part of New Ross urban district transferred from County Kilkenny under the Local Government (Ireland) Act 1898.

1885–1918: The baronies of Bargy, Forth and Shelburne, and those parts of the baronies of Bantry and Shelmaliere West not included in the constituency of North Wexford.

1918–1922: The existing South Wexford constituency together with that part of the existing South Kilkenny constituency contained within the administrative county of Wexford.