| San Mateo | |
| Native Name Lang: | es |
| Settlement Type: | District |
| Mapsize: | frameless |
| Subdivision Type: | Country |
| Subdivision Name: |  Peru |
| Subdivision Type1: | Region |
| Subdivision Name1: | Lima |
| Subdivision Type2: | Province |
| Subdivision Name2: | Huarochirí |
| Parts Type: | Subdivisions |
| Parts Style: | para |
| Established Title: | Founded |
| Seat Type: | Capital |
| Seat: | San Mateo |
| Leader Title: | Mayor |
| Leader Name: | Luis Eduardo Rincon Franco (2019–2022) |
| Unit Pref: | Metric |
| Area Total Km2: | 425.6 |
| Elevation M: | 3149 |
| Population Total: | 4245 |
| Population As Of: | 2017 |
| Population Density Km2: | auto |
| Timezone1: | PET |
| Utc Offset1: | -5 |
| Blank Name Sec1: | UBIGEO |
| Blank Info Sec1: | 150722 |
San Mateo District is one of thirty-two districts of the Huarochirí Province, located in the Department of Lima in Peru.[1] It was one of eleven districts that formed the Huarochirí Province after it was created by decree on August 4, 1821, during the Protectorate of San Martín.
The La Viuda and the Paryaqaqa or Waruchiri mountain ranges traverse the district. Some of the highest mountains of the district are listed below:[2]