Llanwddyn () was the name of an electoral wards in the far north of Powys, Wales. It covered the community of Llanwddyn (which gives it its name) as well as the neighbouring communities of Llangynog and Pen-y-Bont-Fawr.[1] The ward elected a county councillor to Powys County Council.
According to the 2011 census the population of the ward was 1,036.[2]
Following a boundary review, Llanwddyn was merged to become part of the larger ward of Banwy, Llanfihangel and Llanwddyn, effective from the 2022 local elections.[3]