The Old Mill, Ruthin, Denbighshire, North Wales was designated Grade II listed building on the 24 October 1950; the mill probably dates from around 1300. The Warden of Ruthin, the early nineteenth century, Archdeacon Newcome, noted that the building had been used as a garrison chapel. There are two early English pointed arches and one gable end has a blocked lancet window, with a sunken cross above.