Sir John Baird of (by East Linton), Lord Newbyth (1620–1698), was a Scottish advocate, judge, politician and diplomat. He served as Commissioner for Aberdeenshire in the Parliament of Scotland. Baird was the son of James Baird of Byth in the same county, advocate, and for some time commissary of Edinburgh, and Bathia, daughter of Sir of , was admitted advocate on 3 June 1647. It must have been about the same year that he married Margaret, daughter of of , by whom he had four children, three sons and one daughter, viz. John, born on 4 Oct 1648; Margaret, born on 23 Dec 1649; John, born on 23 Sep 1652; and William, born on 12 Nov 1654.