{{Infobox officeholder|name=John Comyn III|image= |birth_date=c. 1274|birth_place=|death_date=February 10, 1306|death_place=Greyfriars, Dumfries|religion=|spouse=|children=|alma_mater=|party=|office=Lord of Badenoch|term_start=1302|term_end=1306|preceded=[[John Comyn II]]|succeeded=}}'''Comyn III, Lord of Badenoch ''' (1274-1306) was a rival to the Scottish throne, he was murdered by [[Robert the Bruce]] in 1306.