Sir Robert VI de Brus (July 1243 – soon before 4 March 1304), 6th Lord of Annandale (dominus vallis Anandie), jure uxoris Earl of Carrick (1271–1292), Lord of Hartness, Writtle and Hatfield Broad Oak (Wretele et Hatfeud Regis), was a cross-border lord, and participant of the Second Barons' War, Ninth Crusade, Welsh Wars, and First War of Scottish Independence.
Of Scoto-Norman heritage, through his father he was a third-great grandson of David I of Scotland.
His ancestors included Richard (Strongbow) de Clare, 2nd Earl of Pembroke, King of Leinster and Governor of Ireland, and William Marshal, 1st Earl of Pembroke, regent of England, and Henry I of England.