The Keith baronetcy, of Ludquharn, Aberdeenshire (or Ludquhairn) was created in the Baronetage of Nova Scotia on 28 July 1629 for William Keith, son of Sir William Keith of Ludquharn and his wife Margaret, sister of George Keith, 5th Earl Marischal. The remainder was to all male heirs whatsoever.
The title became dormant on the death of the 5th Baronet in 1771. It does not appear, as of , on the Official Roll of the Baronetage.