Sir Roger Brabazon (c. 1247 13 June 1317 14 June 1317) was an English lawyer, and Chief Justice of the King's Bench from 1296 to 1316. Little is known of his background, he was the son of William le Brabazon, and may have been born at Mowsley in Leicestershire in or before 1247. Sir Roger was in the service of Edmund of Lancaster from 1275, and through Edmund's patronage he started receiving judicial commissions from the mid-1280s. In 1290, after Ralph de Hengham had been dismissed from the King's Bench, Brabazon was hired as a junior justice. In 1291 2, Brabazon took part in hearing the 'Great Cause' concerning Edward I's overlordship over Scotland, and pronounced the judgement in favour of John Balliol as heir to the Scottish crown.