|Full name||Hernán Edgardo Díaz|
|Date of birth||February 26, 1965|
|Place of birth||Barrancas, Santa Fe, Argentina|
|Height||1.75 m (5 ft 9 in)|
|Playing position||Right back|
|* Senior club appearances and goals counted for the domestic league only|
Hernán Edgardo Díaz (born February 26, 1965 in Barrancas) is a former Argentine football right back. During his club career he played for Rosario Central, Los Andes, River Plate and Colón de Santa Fe.
Díaz started his career in the Argentine 2nd division with Rosario Central in 1985, after a short spell with Los Andes he returned to Rosario to help the club win the 1986-1987 Primera Division Argentina. His performances earned him a place in the national team and he represented Argentina at the Copa América 1987 and 1989.
Díaz joined River Plate in 1989, helping the club to win the 1989-1990 title in his first season he went on to win 8 league titles with the club as well as the Copa Libertadores in 1996 and the Supercopa Sudamericana in 1997. His 10 titles as a player make him the second most decorated player in the history of Club Atlético River Plate, second only to his longtime team mate Leonardo Astrada's 11.
Díaz left River to join Colón de Santa Fe in 2000 but returned for one last season with River in 2000-2001.
- Primera División Argentina: 1986–87
- Primera División Argentina: 1989–90, Apertura 1991, Apertura 1993, Apertura 1994, Apertura 1996, Clausura 1997, Apertura 1997, Apertura 1999
- Copa Libertadores: 1996
- Supercopa Sudamericana: 1997
- Díaz is the second most decorated player in the history of Club Atlético River Plate with 10 titles.
- Díaz played 73 games in the Copa Libertadores, scoring 7 goals, the only Argentine to have played more Libertadores games was Julio César Falcioni with 76.
- Hernán Díaz at National-Football-Teams.com