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 | 
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| Auchenharvie Castle | Ruin | Private | Near Torranyard | A dangerous site | 
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| Hill of Beith Castle | Tower | 17th century | Foundations only | Private | Beith | Demolished in the 1750s | 
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| 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 | 
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| Clonbeith Castle | Ruin | Private farm | Near Auchentiber | 
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| 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 | 
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| Hessilhead Castle | Scant remains | Private | Near Lugton | A Wildlife Rescue Centre occupies part of the old estate | 
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| Kelburn Castle | Castle open | ||||||
| Kerelaw Castle | Ruin | North Ayrshire Council | Saltcoats | Fenced off - dangerous | 
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| Kersland Castle | Tower | 15th century | Ruin | Private | Near Dalry | Located at Easter Kersland Farm | 
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| Kilbirnie Place | Tower | 14th century | Ruin | Private | Near Kilbirnie | On a golf course | 
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| Kildonan Castle | 13th century | 
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| Law Castle | 15th century | 
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| Lochranza Castle (Arran Island) | Historic Scotland | Lochranza NR935505 | 
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| 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 | 
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| Montgreenan Castle | Ruin | Private | Near Kilwinning | Montgreenan House is nearby. Also known as the 'Bishop's Palace' | 
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| Pitcon | Fortified tower | Demolished | Private | Near Dalry | An 18th-century mansion is now present near the site | ||
| Portencross Castle | 
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| Roughwood Tower | Fortified tower | 15th century | Demolished | Private | Near Beith | A farm with old outbuildings is on the site | 
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| Seagate Castle | Fortified townhouse | 16th century | Ruin | North Ayrshire Council | In Irvine | access on Doors Open Days only | 
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| 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 | 
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