Coordinates: 52°57′22″N 3°34′08″W / 52.956°N 3.569°W
Meirionnydd Nant Conwy was a constituency of the National Assembly for Wales. It elected one Assembly Member by the first past the post method of election. Also, however, it was one of eight constituencies in the Mid and West Wales electoral region, which elected four additional members, in addition to eight constituency members, to produce a degree of proportional representation for the region as a whole.
The constituency was created for the first election to the Assembly, in 1999, with the name and boundaries of the Meirionnydd Nant Conwy Westminster constituency. It was partly within the preserved county of Clwyd and partly within the preserved county of Gwynedd. The constituency was abolished following boundary changes for the 2007 Assembly elections.