Affleck Castle, also known as Auchenleck Castle, is a tall L-plan tower house dating from the 15th century, 1 mile (1.6 km) west of Monikie Parish Church, Angus, Scotland. It is a scheduled monument. It is not open to the public.
The castle was built on the lands of the Auchenlecks of that Ilk. In the early 18th century it belonged to a family of Reids, who forfeited the castle in 1746 because of their activities as Jacobites. It has not been occupied since 1760, when a new mansion was built.
Affleck Castle is a well-preserved free-standing tower of four storeys and a parapeted garret. It is 60 feet (18 m) tall, and has thick rubble walls, with several mural rooms. A few steps down from the entrance is the basement, which is sub-divided.
The hall, which is on the first floor, has a vaulted ceiling; this supports a withdrawing room. Above the main staircase is an entresol bedroom, almost 7 feet (2.1 m) square, reached by an eleven-step staircase in the east wall. The stairs lead from the hall. The withdrawing room has a spy-hole into the hall below. This would have allowed all movement to the main turnpike stair to be observed. The room has window seats, wall closets, and a shafted fireplace. A step up from this room leads to a circular oratory, equipped with aumbry, piscine, holy-water stoup and stone candle-holders. This room is also vaulted. There is a bedroom in each of the upper floors.
A projection by the door, with a square caphouse, houses the stair. There is another square caphouse over the south-west angle. There are two devices for dropping missiles or liquids on attackers: one over the arched door; and the other on the west front, while the ground floor is equipped with gun loops.
- "Affleck Castle". Canmore. Royal Commission on the Ancient and Historical Monuments of Scotland. Retrieved 2013-04-16.
- Lindsay, Maurice (1986) The Castles of Scotland. Constable. ISBN 0-09-473430-5 p.46
- Historic Environment Scotland. "Affleck Castle (SM90007)". Retrieved 2019-03-25.
- "Affleck Castle". Gazetteer for Scotland. Retrieved 2013-05-15.