Lydart is a dispersed hamlet within the community of Mitchel Troy, Monmouthshire, Wales. It is located about 3 miles (4.8 km) south-west of Monmouth, 3 miles (4.8 km) north of Trellech, and 1 mile (1.6 km) south-east of Mitchel Troy village, on the top of an escarpment which slopes steeply down to the valley of the River Trothy. The B4293 road passes through the area.