Kinmuck Castle was a 14th-century castle, about north-east of Ellon, Aberdeenshire, Scotland, at, or close to, Mains of Kinmuck. Alternative names are Castle of Kinmuck, Carmuck Castle and Kermuck Castle. Castle of Kinmuck is the locally accepted spelling.
In 1413 the castle belonged to Thomas Kennedy, Constable of Aberdeen, who dismantled it to build the old Ellon Castle.
Only vague traces of a circular ditch enclosing an area wide remain. The ditch was filled in 1867.