| Diego Viera | |
| Fullname: | Diego Francisco Viera Ruiz Díaz |
| Birth Date: | 1991 4, df=yes |
| Birth Place: | Capiatá, Paraguay |
| Height: | 1.86m |
| Position: | Centre back |
| Currentclub: | Libertad |
| Clubnumber: | 5 |
| Years1: | 2010–2011 |
| Clubs1: | Cerro Porteño |
| Caps1: | 9 |
| Goals1: | 0 |
| Years2: | 2011 |
| Clubs2: | Rubio Ñu |
| Caps2: | 1 |
| Goals2: | 0 |
| Years3: | 2012 |
| Clubs3: | Tacuary |
| Caps3: | 44 |
| Goals3: | 3 |
| Years4: | 2013 |
| Clubs4: | Sportivo Luqueño |
| Caps4: | 31 |
| Goals4: | 2 |
| Years5: | 2014 |
| Clubs5: | Cerro Porteño |
| Caps5: | 5 |
| Goals5: | 0 |
| Years6: | 2015–2019 |
| Clubs6: | Godoy Cruz |
| Caps6: | 106 |
| Goals6: | 3 |
| Years7: | 2019– |
| Clubs7: | Libertad |
| Caps7: | 58 |
| Goals7: | 4 |
| Pcupdate: | 23:41, 6 September 2021 (UTC) |
Diego Francisco Viera Ruiz Díaz (born 30 April 1991), known as Diego Viera, is a Paraguayan footballer currently playing for Club Libertad of the Paraguayan Primera División.