The Cardigan District of Boroughs was a parliamentary constituency in Wales which returned one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom and its predecessors, from 1542 until it was abolished for the 1885 general election. The borough constituency comprised the four towns of Cardigan, Aberystwyth, Lampeter and Adpar - geographically separated from each other but all within the county of Cardiganshire.