Llanddeusant (Welsh for 'the church of two saints'; Welsh pronunciationⓘ) is a small linear village, on Anglesey, North Wales about 10 miles (16 km) north east of Holyhead.

It was wholly rebuilt in 1868 by a local Welsh architect, Goronwy Roberts.

[1] Llanddeusant is claimed to be the burial place of Branwen (Mabinogion).

A cairn was discovered nearby and is now named 'Bedd Branwen' in Welsh.

It also has the area's last working water mill,[5] Melin Hywel.