Meirionnydd Nant Conwy is a Parliamentary constituency in Wales. It consists of Conwy and Merioneth. It has the lowest population of any constituency in Wales, and also has the highest proportion of Welsh-speaking voters.

From 1974 to 1992 the parliamentary constituency was represented by Dafydd Elis-Thomas who now represents Meirionnydd Nant Conwy in the National Assembly for Wales. It is currently represented by Elfyn Llwyd, both of Plaid Cymru.