Ellon Castle is a scheduled monument within the town of Ellon, Aberdeenshire. Only ruins survive of the 16th-century structure that may incorporate sections from the 15th century together with 18th-century renovations. The ruins form a focal point in a formal 6 acre garden planted in 1745; an older Category A listed sundial dating from c. 1700 forms the centrepiece to the garden.
In the town of Ellon, Aberdeenshire, people had the means to tell the time of day several centuries ago.