Barry was a parliamentary constituency in Glamorgan (later South Glamorgan), Wales which returned one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom, elected by the first past the post voting system.
The district of Penarth which formed 23.6% of the constituency joined the majority of the Cardiff SE seat to form the new Cardiff South and Penarth.
1950–1955: The Borough of Barry, and the Rural District of Cardiff.
1955–1974: The Borough of Barry, and the Rural District of Cardiff except the parts of the parishes of Lisvane and Radyr added to the County Borough of Cardiff by the Cardiff Extension Act 1950.
1974–1983: The Borough of Barry, the Urban District of Penarth, and the Rural District of Cardiff except the parish of Van.