LAUDER, a royal and parliamentary burgh of Scotland, county of Berwick, near the Leader, a tributary of the Tweed, 24 miles S.E. from Edinburgh. The burgh possesses a common of 1700 acres, belonging exclusively to a few privileged burgesses. In the neighbourhood is the mansion of Thirlstane, the seat of the Earl of Lauderdale; and about half a mile from the town stood the old bridge over the Leader, where the favourites of James III. were hanged. Lauder unites with Haddington, Jedburgh, Dunbar, and North Berwick in returning one M.P. Pop. (1851) 1105.