| Diego Fernández | |
| Fullname: | Diego Nicolás Fernández Castro |
| Birth Date: | 8 March 1998 |
| Birth Place: | Loncoche, Chile |
| Position: | Midfielder |
| Youthclubs1: | Deportes Iquique |
| Years1: | 2014–2021 |
| Caps1: | 107 |
| Goals1: | 6 |
| Years2: | 2022–2023 |
| Caps2: | 45 |
| Goals2: | 1 |
| Nationalyears1: | 2014 |
| Nationalteam1: | Chile U17 |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
| Nationalyears2: | 2019 |
| Nationalteam2: | Chile U22 |
| Nationalcaps2: | 0 |
| Nationalgoals2: | 0 |
| Club-Update: | 14 December 2023 |
Diego Nicolás Fernández Castro (born 8 March 1998) is a Chilean footballer who plays as a midfielder. He last played for O'Higgins.
In 2022 and 2023, Fernández played for O'Higgins.[1]
Fernández represented Chile at under-17 level in the 2014 South American Games.[2] He also was a member of the Chile U22 squad in the 2019 Toulon Tournament.