| Valentín Mancini | |
| Birth Date: | 2 June 2003 |
| Birth Place: | Arroyito, Córdoba, Argentina |
| Height: | 1.64 m |
| Currentclub: | Panathinaikos B |
| Clubnumber: | 45 |
| Position: | Winger |
| Youthclubs1: | Aldosivi |
| Years1: | 2022–2024 |
| Clubs1: | Aldosivi |
| Caps1: | 4 |
| Goals1: | 0 |
| Years2: | 2023–2024 |
| Clubs2: | → Panathinaikos B (loan) |
| Caps2: | 18 |
| Goals2: | 0 |
| Years3: | 2024– |
| Clubs3: | Panathinaikos B |
| Caps3: | 11 |
| Goals3: | 0 |
| Pcupdate: | 1 June 2024 |
Valentín Mancini (born 2 June 2003) is an Argentine professional footballer who plays as a winger for Greek Super League 2 club Panathinaikos B.
He is the younger brother of Panathinaikos player, Daniel Mancini.