Jean IV de Rieux (June 27 1447 - February 9 1518), was a Breton noble and Marshal.
He was the son of Jean III de Rieux and Béatrice de Rohan-Montauban (1385-1414), dame de La Gacilly, fille de Guillaume de Montauban, seigneur de Montauban et de Landal.
He is best known for being the commander of the Breton army against King Charles VIII of France, which ended in a crushing defeat.
He was also Count of Aumale and Count of Harcourt.
He married Isabelle de Brosse (died 1527), daughter of Jean III de Brosse, Comte de Penthièvre.
Renée de Rieux, La Belle Châteauneuf, was one of his descendants.