Penarth is a town in the Vale of Glamorgan, Wales.
Penarth may also refer to: Penarth, Cardiganshire, a former hundred of Cardiganshire, Wales, UK Penarth, Delaware, an unincorporated community in New Castle County, Delaware, U.S. Penarth (Newtown and Llanllwchaiarn), a house in Powys, Wales Penarth Group, a Rhaetian age (Triassic) lithostratigraphic group Penarth RFC, a Welsh rugby union club