John I of Alençon, known as the Wise (1385 – 25 October 1415), was a French nobleman, killed at the Battle of Agincourt.

John was born in Château d'Essay, the son of Peter II of Alençon and Marie Chamaillard.

He commanded the second division of the French army at the Battle of Agincourt.

He is sometimes credited with killing Edward, Duke of York, wounding Humphrey, Duke of Gloucester, and cutting an ornament from the crown of Henry V, King of England.

He was overpowered by King Henry's bodyguard and slain before he could yield himself.