Manuel Dionysios Díaz Martínez (1874–1929) was a Cuban fencer who competed in the 1904 Summer Olympics in St. Louis. He was born in Havana and died in Rochester, New York.Javier Ibáñez Díaz is a boxer who competes for Bulgaria.Yaimillie Marie Diaz Colon (b. 2004) is a Puerto Rican Paralympic athlete who competed at the 2024 Paralympics in Paris.