Rieul or Saint Rieul may refer to:
People Saint Rieul of Senlis (died 260) bishop of Senlis Saint Rieul of Reims (died 698) bishop of Reims Roland Rieul (born 1906), French soldier and British spy
Geography Saint-Rieul, a commune in Brittany, France Church of Saint-Rieul, Brenouille, France Tour Saint-Rieul, a tower at Church of Saint-Justin in Louvres (Val-d'Oise)
Language Rieul (hangul), the Korean letter "ㄹ"