| Sundrum Castle | |
|---|---|
 | |
| Type | Castle |
| Location | South Ayrshire, Scotland |
| OS grid reference | NS 41074 21256 |
| Built | 14th century |
Listed Building – Category B | |
| Official name | Sundrum Castle |
| Designated | 14 April 1971 |
| Reference no. | LB1068 |
  Location of Sundrum Castle in South Ayrshire | |
Sundrum Castle is a Scottish medieval castle located 1.5 kilometres (0.93 mi) north of Coylton, South Ayrshire, by the Water of Coyle river. It was built in the 14th century for Sir Duncan Wallace, Sheriff of Ayr. The castle was inherited by Sir Alan de Cathcart, who was the son of Duncan's sister. The Cathcarts sold Sundrum in the 18th century, where it eventually fell into the possession of the Hamilton family. The Hamiltons expanded the castle in the 1790s, incorporating the original keep into a mansion.
The castle was further expanded in the early 20th century by Ernest Coats. For a time it was a hotel, but fell into disrepair. It became a category B listed building in 1971. After extensive renovations in the 1990s, it was split into several privately owned properties.