| Walter Lemma | |
| Fullname: | Walter Oscar Lemma |
| Birth Date: | 6 March 1973 |
| Birth Place: | Lanús, Argentina |
| Position: | Midfielder |
| Youthclubs1: | Lanús |
| Years1: | 1991–1995 |
| Caps1: | 94 |
| Goals1: | 3 |
| Years2: | 1995 |
| Caps2: | 7 |
| Goals2: | 0 |
| Years3: | 1996–1997 |
| Caps3: | 29 |
| Goals3: | 1 |
| Years4: | 1998–1999 |
| Years5: | 1999–2000 |
| Years6: | 2000–2001 |
| Caps6: | 8 |
| Goals6: | 0 |
| Manageryears1: | 2009–2014 |
| Managerclubs1: | Lanús (youth) |
| Manageryears2: | 2015–2017 |
| Managerclubs2: | Talleres (youth) |
| Manageryears3: | 2017–2019 |
| Managerclubs3: | Talleres (reserves) |
| Manageryears4: | 2020 |
| Managerclubs4: | Tijuana (assistant) |
| Manageryears5: | 2020–2023 |
| Managerclubs5: | Colo-Colo (assistant) |
| Manageryears6: | 2024 |
| Managerclubs6: | Vélez Sarsfield (assistant) |
| Manageryears7: | 2024– |
| Managerclubs7: | Unión La Calera |
Walter Oscar Lemma (born 6 March 1973) is an Argentine football manager and former player who played as a midfielder. He is the current manager of Chilean club Unión La Calera.
Born in Lanús, Buenos Aires Province, Lemma made his senior debut with hometown side Lanús before moving to Estudiantes de La Plata in 1995. In the following year, after being rarely used, he joined Banfield.
After spells at Italian clubs Ancona and Virtus Entella, Lemma returned to his home country in 2000 with San Martín de San Juan. He retired in the following year, aged 28.
Lemma began his managerial career in 2009, after being named in charge of the youth sides of his first club Lanús. He moved to Talleres in 2015 under the same role, before replacing Lucas Bovaglio at the helm of the latter's reserve team on 21 July 2017.[1]
On 18 December 2019, Lemma left Talleres to become Gustavo Quinteros' assistant at Liga MX side Tijuana.[2] He followed Quinteros to Colo-Colo[3] and Vélez Sarsfield,[4] also as his assistant.
On 5 June 2024, Lemma was presented as manager of Unión La Calera in Chile, which was his first managerial experience.[5]