| San Jerónimo de Tunán | |
| Native Name: | Tunan |
| Native Name Lang: | es |
| Settlement Type: | District |
| Mapsize: | frameless |
| Subdivision Type: | Country |
| Subdivision Name: |  Peru |
| Subdivision Type1: | Region |
| Subdivision Name1: | Junín |
| Subdivision Type2: | Province |
| Subdivision Name2: | Huancayo |
| Parts Type: | Subdivisions |
| Parts Style: | para |
| Established Title: | Founded |
| Established Date: | October 5, 1854 |
| Seat Type: | Capital |
| Seat: | San Jerónimo de Tunán |
| Leader Title: | Mayor |
| Leader Name: | Wilfredo Severo León Suazo |
| Unit Pref: | Metric |
| Area Total Km2: | 20.99 |
| Elevation M: | 3274 |
| Population Total: | 9161 |
| Population As Of: | 2005 census |
| Population Density Km2: | auto |
| Timezone1: | PET |
| Utc Offset1: | -5 |
| Blank Name Sec1: | UBIGEO |
| Blank Info Sec1: | 120130 |
San Jerónimo de Tunán District is one of twenty-eight districts of the province Huancayo in Peru.[1]