| Guillermo Díaz | |
| Fullname: | Guillermo Díaz Gastambide |
| Birth Date: | 31 December 1979 |
| Birth Place: | Montevideo, Uruguay |
| Height: | 1.80 m |
| Position: | Defender |
| Years1: | 1999–2000 |
| Caps1: | – |
| Goals1: | 3 |
| Years2: | 2003–2004 |
| Caps2: | – |
| Goals2: | 0 |
| Years3: | 2005–2008 |
| Caps3: | – |
| Goals3: | 1 |
| Years4: | 2008–2010 |
| Caps4: | 78 |
| Goals4: | 3 |
| Years5: | 2011 |
| Caps5: | 20 |
| Goals5: | 0 |
| Years6: | 2012–2013 |
| Caps6: | 35 |
| Goals6: | 0 |
| Pcupdate: | 10 January 2014 |
Guillermo Díaz Gastambide (born 31 December 1979 in Montevideo) is a Uruguayan football who played as a defender.[1]