Sir John Baird, Lord Newbyth (1620 – 1698), was a Scottish advocate, judge, politician and diplomat.
Baird appears to have been knighted by Charles II on his accession to the throne of Scotland in 1651, In the correspondence of the Earls of Ancram and Lothian (1616–67) we find him referred to as Sir John, under date 1653.
Like his father he belonged to the covenanting party, and was considered of sufficient consequence to be excluded from the operation of the Act of Indemnity passed by the parliament of Scotland in 1662, being then mulcted in the sum of 2,400l.
By reason of his opposition to the arbitrary measures of the government he was superseded in the office of lord of session in 1681, Sir Patrick Ogilvie of Boyne being appointed in his place.
On the accession of the Prince of Orange he was re-appointed ordinary lord of session (1689), and retained his seat upon the bench until his death in 1698.