Llanfaglan is a parish in Gwynedd in the hundred of Is-Gorfai. It is some 2 miles S.W. of Caernarfon on the shore of Menai Strait. Fort Belan, a Grade 1 listed building is at the extremity of the parish guarding the entrance of the Strait.

The church in Llanfaglan, St. Baglan's church (Grid reference ) stands alone in the middle of a field and is now a friendless church owned by the Friends of Friendless Churches. The church which may have a pre-Christian foundation contains a stone, inscribed "Lovernus Fil. Although the Christian church probably dates from the 13th century, additions date from the 17th century as do the internal fittings. The Church remains consecrated and is still in occasional use.