| Santiago Viera | |
| Fullname: | Santiago Nicolás Viera Moreira |
| Birth Date: | 4 June 1998 |
| Birth Place: | Montevideo, Uruguay |
| Currentclub: | Fénix |
| Clubnumber: | 21 |
| Position: | Midfielder |
| Youthclubs1: | Liverpool Montevideo |
| Years1: | 2016–2022 |
| Clubs1: | Liverpool Montevideo |
| Caps1: | 49 |
| Goals1: | 1 |
| Years2: | 2019 |
| Clubs2: | → Cerro (loan) |
| Caps2: | 29 |
| Goals2: | 2 |
| Years3: | 2020 |
| Clubs3: | → San Antonio FC (loan) |
| Caps3: | 3 |
| Goals3: | 0 |
| Years4: | 2022 |
| Clubs4: | Juventud |
| Caps4: | 10 |
| Goals4: | 0 |
| Years5: | 2022–2023 |
| Clubs5: | Cerro Largo |
| Caps5: | 39 |
| Goals5: | 0 |
| Years6: | 2024 |
| Clubs6: | Atlético Morelia |
| Caps6: | 6 |
| Goals6: | 0 |
| Years7: | 2024– |
| Clubs7: | Fénix |
| Caps7: | 3 |
| Goals7: | 0 |
| Nationalyears1: | 2016–2017 |
| Nationalteam1: | Uruguay U20 |
| Nationalcaps1: | 16 |
| Nationalgoals1: | 0 |
| Pcupdate: | 16 September 2024 |
| Ntupdate: | 11 June 2017 |
Santiago Nicolás Viera Moreira (born 4 June 1998) is a Uruguayan footballer who plays as a midfielder for Fénix in the Uruguayan Primera División.
Viera joined San Antonio on a season-long loan deal on 15 January 2020.[1]