John "the Red" Comyn, Scottish nobleman
John Comyn III of Badenoch, nicknamed the Red (c. 1274 – 10 February 1306), was a leading Scottish baron and magnate who played an important role in the First War of Scottish Independence. He served as Guardian of Scotland after the forced abdication of his uncle, King John Balliol (r. 1292–1296), in 1296, and for a time commanded the defence of Scotland against English attacks. Comyn was stabbed to death by Robert the Bruce before the altar at the church of the Greyfriars at Dumfries.

His father, John Comyn II, known as the Black Comyn, had been one of the competitors for the Crown of Scotland, claiming his descent from King Donald III. His mother was Eleanor Balliol, sister of King John Balliol. He had, moreover, links with the royal house of England: in the early 1290s, he married Joan de Valence, cousin of King Edward I.