Sir Robert Lauder of the Bass (before 1440 - c. January 1508) was a Scottish knight, armiger, and Governor of the Castle at Berwick-upon-Tweed. He was also a member of the old Scottish Parliament. The Lauders held the feudal barony of The Bass (the caput of which was its castle), East Lothian, Edrington Castle and lands in the parish of Mordington, Berwickshire, Tyninghame in Haddingtonshire (from the Archbishopric of St Andrews), and numerous other estates and properties elsewhere in Scotland.
Lauder was the eldest son and heir of Robert Lauder of the Bass (d.1495) by his first spouse Jonet, daughter of Sir Alexander Home, Knt.
Prior to his father's death, Robert jnr., was usually designated "of Edrington" in Berwickshire. After his purchase of the lands of Beil (modern Biel), near Stenton in East Lothian he was also often designated 'of Beil'.
In 1461/2 Berwick-upon-Tweed was recovered by the Scots and Robert Lauder of Edrington put in charge of the castle. "About 1462 Berwick Castle was put into the hands of Robert Lauder of Edrington, an important official and soldier in Scotland at that time. Lauder kept his position uninterruptedly until 1474 when he was succeeded by David, Earl of Crawford. In 1464 Robert Lauder was paid £20 for repairs made to Berwick Castle".
A notorial instrument dated 13 May 1465 narrates:
[this] Robert Lauder, son and apparent heir of Sir Robert Lauder of Edrington, asserted that David Lauder of Popil (East Lothian) had given sasine and heritable possession to his eldest son James Lauder and Jonete his spouse, their heirs etc., of a certain piece of land at Popil, to the prejudice of the first-mentioned Robert, who solemnly protested that the said sasine should neither be valid nor prejudice his right in the land, and for greater security, he, by throwing of earth and stone outside the house belonging to the piece of land, and by breaking a plate with his foot, broke and annulled the said sasine and so possession by James Lauder and his wife. Done at Popil at 7 a.m. on 13th May 1465 before Henry Ogil of Popil, James Ogil his eldest son, and others.