| Juan Martín de Pueyrredón | |
| Native Name Lang: | es |
| Settlement Type: | Department |
| Mapsize: | frameless |
| Seat Type: | Seat |
| Population: | 168,771 |
| Coordinates: | -33.3°N -86°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Argentina |
| Subdivision Type1: | Province |
| Land Area: | 13,120 |
Juan Martín de Pueyrredón is a department of the province of San Luis, Argentina. Its headtown is the city of San Luis, which is also the largest and capital city of the province of San Luis.
With an area of 13120sqkm it borders to the north with Belgrano Department, to the east with Coronel Pringles, to the south with Gobernador Dupuy, and to the west with Mendoza Province.
Until 2010, as per Law #V-0106-2004 (5490)[1] its name was La Capital Department (Spanish; Castilian: '''Departamento La Capital''') but according to law #V-0748-2010, the name has been changed to Juan Martín de Pueyrredón.[2]