Carreglefn is a village in Anglesey, in north-west Wales., in the community of Mechell. Its name possibly means 'Smooth Stone'.[citation needed] The Village has a few pleasant walking routes around it. The covered reservoir south of Carreglefn, and near Llanol, is one of the highest points above sea level in the county. There is a Community Hall shared with Ysgol Carreglefn

Until 1984 Carreglefn was a community.