List
| Name | Type | Date | Condition | Ownership | Location | Notes | Picture |
|---|---|---|---|---|---|---|---|
| Ailsa Craig Castle | Tower | Ruin | Private | Off Girvan | |||
| Ardrossan Castle | Ruin | Ardrossan | Accessible to the public |  | |||
| Auchenharvie Castle | Ruin | Private | Near Torranyard | A dangerous site |  | ||
| Hill of Beith Castle | Tower | 17th century | Foundations only | Private | Beith | Demolished in the 1750s |  |
| Broadstone Castle | No remains | Private | Beith | Demolished in 1850 to build the nearby farm | |||
| Brodick Castle | Historic House | National Trust for Scotland | Isle of Arran |  | |||
| Clonbeith Castle | Ruin | Private farm | Near Auchentiber |  | |||
| Cloncaird Castle | Historic Castle | Private | by Maybole | ||||
| Little Cumbrae Castle | Tower | 16th century | Ruin | Private | Near Cumbrae Island |  | |
| Cunninghamhead Castle | No remains | Private | Near Irvine | ||||
| Eglinton Castle | Ruin | North Ayrshire Council | Irvine | Now Eglinton Country Park |  | ||
| Fairlie Castle | Tower | 15th century | Ruin | Private | Fairlie |  | |
| Giffen castle | No remains | Private | Near Barrmill | Parts of it are incorporated into Barrmill Mill | |||
| Glengarnock Castle | Tower | Ruin | Private | Kilbirnie |  | ||
| Hessilhead Castle | Scant remains | Private | Near Lugton | A Wildlife Rescue Centre occupies part of the old estate |  | ||
| Kelburn Castle | Castle open | ||||||
| Kerelaw Castle | Ruin | North Ayrshire Council | Saltcoats | Fenced off - dangerous |  | ||
| Kersland Castle | Tower | 15th century | Ruin | Private | Near Dalry | Located at Easter Kersland Farm |  |
| Kilbirnie Place | Tower | 14th century | Ruin | Private | Near Kilbirnie | On a golf course |  |
| Kildonan Castle | 13th century |  | |||||
| Law Castle | 15th century |  | |||||
| Lochranza Castle (Arran Island) | Historic Scotland | Lochranza NR935505 |  | ||||
| Monkcastle | Ruin | Private | Near Kilwinning | ||||
| Montfode Castle | Fortified tower | 16th century | Mostly demolished | Private | Near Ardrossan | One tower and a short section of wall remain |  |
| Montgreenan Castle | Ruin | Private | Near Kilwinning | Montgreenan House is nearby. Also known as the 'Bishop's Palace' |  | ||
| Pitcon | Fortified tower | Demolished | Private | Near Dalry | An 18th-century mansion is now present near the site | ||
| Portencross Castle |  | ||||||
| Roughwood Tower | Fortified tower | 15th century | Demolished | Private | Near Beith | A farm with old outbuildings is on the site |  |
| Seagate Castle | Fortified townhouse | 16th century | Ruin | North Ayrshire Council | In Irvine | access on Doors Open Days only |  |
| Shewalton Castle | Fortified tower | Demolished | Private | Irvine | The castle was demolished in 1806 and a mansion house built on the site, also now demolished. | ||
| Skelmorlie Castle | Tower | 16th century | Inhabited | Private | Near Largs | Much altered |  |
| Stanecastle | Substantial ruin | North Ayrshire Council | Stanecastle, Irvine | Accessible and well maintained |  |
