Sir Robert Bemborough (d.1351) was a medieval knight who led the Montfortist faction during the Combat of the Thirty. This was an arranged battle between thirty knights from both sides during the Breton War of Succession, a struggle for control of the duchy between the House of Montfort and the House of Blois. Bemborough was killed in the battle.
The battle was greatly renowned. Bemborough was subsequently depicted by chroniclers as a model of chivalry.