List of castles in South Ayrshire
This is a list of castles in South Ayrshire.
List
| Name | Type | Date | Condition | Ownership | Location | Notes | Picture |
| Ardstinchar Castle | Ruin | Private | Ballantrae | Mary Queen of Scots once stayed here | |||
| Auchans Castle | Tower House | 17th century | Ruin | Private | Dundonald | Onetime home to Lady Susanna Montgomerie and visited by Dr Samuel Johnson & James Boswell | |
| Baltersan Castle | Ruin | ||||||
| Barnweill Castle | 13th century | Moat only | Private | Craigie | The remains of Barnweill Church lie nearby | ||
| Blairquhan Castle | Historic house | 1824 | Occupied | Private | |||
| Carleton Castle | Tower castle | 15th century | Ruin | Private | Lendalfoot | Held by the Cathcarts of Killochan | |
| Cassillis Castle | Keep | 15th century | Occupied | Private | Minishant | One time home of the Cassillis family | |
| Craigie Castle | Keep | 13th century | Ruin | Craigie | One time home of the Wallace family | ||
| Crosbie Castle | Keep | 14th century | Ruin | South Ayrshire Council | Troon | Demolished by the Fullarton of Fullarton family and made into an ice house | |
| Culzean Castle | Historic house | 1792 | Preserved | National Trust for Scotland | Incorporates an older tower house | ||
| Dalquharran Castle | 15th century | Ruin | Dailly | ||||
| Dalquharran Castle | 1785 | Ruin | Dailly | ||||
| Dundonald Castle | Ruin | Historic Scotland | Dundonald | ||||
| Dunduff Castle | L-shaped Tower | Circa 1696 | Restored | Private | Dunure | Held by the Stewarts and then the Whitefords | |
| Dunure Castle | Keep | 15th century | Ruin | Marquess of Ailsa | Dunure | ||
| Fail Castle | Tower | 16th century | Sparse remains | Private | Tarbolton | Modified part of Fail Monastery | |
| Gadgirth Castle | Tower | 14th Century | Demolished | Private | Annbank | Mansion house was built on the site | |
| Gadgirth Old Ha' | Tower | Prior to 14th Century | Sparse remains | Private | Annbank | Replaced by Gadgirth Castle that was demolished in 1808. Held by the Chalmer family | |
| Glenapp Castle | Occupied | ||||||
| Greenan Castle | Ruin | ||||||
| Killochan Castle | 1581 | Occupied | Near Girvan | ||||
| Maybole Castle | 1560 | Occupied | Maybole | ||||
| Penkill Castle | 16th century | Occupied | |||||
| Sundrum Castle | Occupied | ||||||
| Thomaston Castle | Ruin | ||||||
| Turnberry Castle | Ruin |