Ceredigion (UK Parliament constituency)

Ceredigion (also Cardiganshire) is a parliamentary constituency represented in the House of Commons of the UK Parliament. Created in 1536, the franchise expanded in the late 19th century and on the enfranchisement of women. Its boundaries remained virtually unchanged until 1983. From 1536 until 1885 the area had two seats (electing MPs): a county constituency (Cardiganshire) comprising the rural areas, the other the borough constituency known as the Cardigan District of Boroughs comprising a few separate towns; in 1885 the latter was abolished, its towns and electors incorporated into the former, reduced to one MP. The towns which comprised the Boroughs varied slightly over this long period, but primarily consisted of Cardigan, Aberystwyth, Lampeter and Adpar, the latter now a suburb of Newcastle Emlyn across the Teifi, in Carmarthenshire.

The county constituency (a distinction from borough class remains, namely as to type of returning officer and permissible electoral expenses) was merged in 1983 with part of Pembrokeshire, making a new constituency named Ceredigion and Pembroke North. In 1997 it was recreated and its non-Anglicised name became its formal name, Ceredigion.

The Ceredigion Senedd constituency was created with the same boundaries in 1999 (as an Assembly constituency).

The constituency is set to be abolished, as part of the 2023 Periodic Review of Westminster constituencies and under the June 2023 final recommendations of the Boundary Commission for Wales for the next United Kingdom general election. The entire constituency would form part of Ceredigion Preseli.