|Cardross, Argyll and Bute, Scotland
|Type||Rectangular tower house|
|Controlled by||Clan Napier until 1820
various owners 1820 to present
|Built||unknown, but after 1290|
|In use||15th century to 21st century|
|Built by||unknown member of the Clan Napier|
Kilmahew castle was built upon the lands granted to the Napiers by Malcolm, the Earl of Lennox around the year 1290. The castle itself was built sometime in the 16th century by the Napier family, who owned it for 18 generations. The Napiers who owned Kilmahew are notable for being the progenitors of most of the Napiers in North America, as well as some of their members who had notable contributions in the field of engineering, such as Robert Napier, the "Father of Clyde Shipbuilding," and David, James and Montague Napier, who owned the engineering company of Napier & Son.
The estate was inherited by George Maxwell of Newark and Tealing (1678–1744) in 1694, when he assumed the name of his maternal grandfather, John Napier of Kilmahew, but having no legitimate children he was the last of the name, although the Napier of Kilmahew coat of arms survives as a quartering of those of Noble of Ardmore, who therefore now represent the family in heraldry. Following his death the estate was successfully claimed by an illegitimate daughter, Jean Smith, who married David Brydie, and was finally sold to Alexander Sharp in 1820 in repayment of gambling debts. In 1839, the estate was acquired by James Burns of Bloomhill (a neighbouring estate), the son of Rev. Dr. John Burns, eventually dying in the Castle in 1871.
- The Nobles of Ardmore and Ardkinglas; Sir Andrew Noble, 1964
- The Book of Dunbartonshire; Irving, 1878
- "Avanti Report". historic-scotland.gov.uk. Retrieved 2008-07-16.
- "Annals of Garelochside". electricscotland.com. Retrieved 2008-07-16.