Mauricio Hernán Díaz Castro (born August 7, 1968) is a retired long-distance runner from Chile. He represented his native country at the 2000 Summer Olympics in Sydney, Australia. On September 22, he achieved his personal best performance there in the men's 10,000 metres, finishing at a time of 28:05.61.
| Representing | |||||
|---|---|---|---|---|---|
| 1999 | Belfast, Northern Ireland | 32nd | Long Race | ||
| 2000 | Vilamoura, Portugal | 36th | Long Race | ||
| 2001 | Ostend, Belgium | 31st | Long Race | ||
| 2002 | Dublin, Ireland | 38th | Long Race | ||
| 2003 | Santo Domingo, Dominican Republic | 5th | 5,000 m | ||
| 2004 | Brussels, Belgium | 41st | Long Race | ||
| 2005 | Saint-Étienne, France | 40th | Long Race | ||