Cwm Cadnant is a community and former electoral ward in Anglesey, north Wales.

Named after the local river, Afon Cadnant, which flows through it, the community takes in the area between the Menai Bridge and Beaumaris.

[2] Prior to the 2013 Isle of Anglesey County Council election Cwm Cadnant was an electoral ward in its own right.

It is now part of the Seiriol ward, which includes the neighbouring Beaumaris, Llanddona, and Llangoed communities.

[1] Home to the constable of Beaumaris Castle around the 1530s, Hafotty is believed to have been originally constructed in the second quarter of the 14th century.