Daniel Diaz may refer to:
- Cata Díaz (Daniel Alberto Díaz, born 1979), Argentine footballer
- Daniel Diaz (musician) (Daniel Horacio Díaz Fernández, born 1963), Argentine musician
- Daniel Diaz (boxer) (born 1984), Nicaraguan boxer
- Daniel Díaz (cyclist) (born 1989), Argentine cyclist
- Daniel Martin Diaz (born 1967), American artist
- Daniel Díaz Maynard (c. 1934–2007), Uruguayan lawyer and politician
- Daniel Díaz Torres (1948–2013), Cuban film director
- Daniel Vázquez Díaz (1882–1969), Spanish painter
- Daniel Orlando Díaz (born 1948), Chilean footballer