Diez or Díez is a surname. Notable people with the surname include:
Barbarito Diez (1909–1995), Cuban singer
Eduardo Díez de Medina, Bolivian politician
Emiliano Díez, Cuban actor
Fabio Díez, Argentinian-Spanish beach volleyball player
Federico Díez de Medina, Bolivian politician
Friedrich Christian Diez (1794–1876), German philologist
Fritz Diez, East German actor and theater director.
Javier Diez Canseco (1948–2013), Peruvian politician
Juan Martín Díez (1775–1825), Spanish guerrilla leader
Juba Diez (born 1944), American politician
Luis Díez del Corral, Spanish lawyer and political scientist
Mauricio González-Gordon y Díez (1928–2013), Spanish sherry maker and conservationist
Nicolás Diez, Argentine footballer
Ricardo Gómez Diez, Argentine politician
Sophie Diez (1820–1887), German operatic soprano
Stefan Diez, (born 1971), German designer
Thomas Diez, Professor of International Relations
Blessed Victoria Díez Bustos de Molina (1903-1936), Spanish teacher and religious woman
