| Leandro Martínez Montagnoli | |
| Full Name: | Leandro Matías Martínez Montagnoli |
| Birth Date: | 21 April 1987 |
| Birth Place: | Buenos Aires, Argentina |
| Height: | 1.87 m |
| Position: | Defender |
| Currentclub: | Cooper |
| Years1: | 2008–2011 |
| Clubs1: | Defensores de Belgrano |
| Years2: | 2011–2014 |
| Clubs2: | Ferro Carril Oeste |
| Caps2: | 55 |
| Goals2: | 0 |
| Years3: | 2014 |
| Clubs3: | Estudiantes de Buenos Aires |
| Caps3: | 18 |
| Goals3: | 0 |
| Years4: | 2015 |
| Clubs4: | Atlanta |
| Caps4: | 30 |
| Goals4: | 2 |
| Years5: | 2016 |
| Clubs5: | Colegiales |
| Caps5: | 19 |
| Goals5: | 0 |
| Years6: | 2016–2017 |
| Clubs6: | Tampico Madero |
| Caps6: | 25 |
| Goals6: | 0 |
| Years7: | 2017–2021 |
| Clubs7: | Defensores de Belgrano |
| Caps7: | 90 |
| Goals7: | 9 |
| Years8: | 2021 |
| Clubs8: | Mitre |
| Caps8: | 11 |
| Goals8: | 0 |
| Years9: | 2021–2022 |
| Clubs9: | All Boys |
| Caps9: | 46 |
| Goals9: | 1 |
| Years10: | 2023 |
| Clubs10: | Tristán Suárez |
| Caps10: | 31 |
| Goals10: | 2 |
| Years11: | 2024 |
| Clubs11: | Defensores de Belgrano |
| Caps11: | 11 |
| Goals11: | 0 |
| Years12: | 2024– |
| Clubs12: | Cooper |
| Caps12: | 8 |
| Goals12: | 1 |
Leandro Matías Martínez Montagnoli (born April 21, 1987) is an Argentine footballer who currently plays for Club Social y Deportivo Cooper.