Archibald Kennedy, 3rd Marquess of Ailsa (1 September 1847 – 9 April 1938) was a Scottish peer.

His mother was the second daughter of Sir Richard Jephson, 1st Baronet and the former Charlotte Rochfort Smith.

In 1885, he founded the Ailsa Shipbuilding Company, which was based in Troon and Ayr, Ayrshire.

The Marquess was a keen sailor, having studied navigation, and had William Fife build him Foxhound in 1870, Bloodhound in 1874, and Sleuthhound in 1881.

Together, they had two more children:[2] Lord Ailsa died at his home, Culzean Castle, overlooking the Firth of Clyde, where he was known as one of the foremost floriculturists, on 9 April 1938.