Dumitru Dumitriu (born 19 November 1945 in Bucharest), commonly known as Țiți Dumitru or Dumitriu III, is a retired Romanian footballer and coach. He is the younger brother of Emil Dumitriu (Dumitriu II) who was an International footballer and champion of Romania with Rapid București and the elder brother of Constantin Dumitriu (Dumitriu IV) who won the Romanian championship with Steaua București.