Pedro Diaz may refer to:
- Pedro Díaz de Tenorio (died 1399), archbishop of Toledo
- Pedro Antonio Díaz (1852–1919), acting President of Panama in 1918
- Pedro Díaz (baseball), (born 1910), Cuban professional baseball player
- Pedro Díaz Lobato (born 1973), Spanish cyclist
- Pedro Díaz (footballer) (born 1998), Spanish association football player
- Pedro Diaz (boxing) boxing trainer
- Pedro Díaz (missionary) (1546–1618), Spanish missionary