The Keith Baronetcy was created in the Baronetage of Nova Scotia on 28 May 1625 for William Keith, 6th Earl Marischal.
He had already succeeded to the title of Earl Marischal in 1623 on the death of his father George Keith, 5th Earl Marischal.
The Keith Baronetcy remained merged with the earldom until its forfeiture in 1716 by George Keith, 10th Earl Marischal, for his support for the Jacobite rising of 1715.
The Keith Baronetcy, of Ludquharn, was created in the Baronetage of Nova Scotia on 28 July 1629 for William Keith.
The Keith Baronetcy, of Powburn in the County of Kincardine, was created in the Baronetage of Nova Scotia on 4 June 1663 for James (or George) Keith.