John I (Breton: Yann, French: Jean; c. 1217/1218 – 8 October 1286), known as John the Red due to the colour of his beard, was Duke of Brittany from 1221 to his death and 2nd Earl of Richmond in 1268.
John was the eldest of three children born to Duchess Alix and her husband and co-ruler, Duke Peter I. He became duke upon his mother's death in 1221. His father, who had reigned as duke due to his marriage to Alix, ruled as regent until John reached adulthood. In 1268, Henry III granted the earldom of Richmond to John, and the title continued in his family, through frequent temporary forfeitures and reversions, until 1342.
