| Aco | |
| Native Name: | Aqu |
| Native Name Lang: | es |
| Settlement Type: | District |
| Mapsize: | frameless |
| Coordinates: | -11.9572°N -75.37°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Peru |
| Subdivision Type1: | Region |
| Subdivision Name1: | Junín |
| Subdivision Type2: | Province |
| Subdivision Name2: | Concepción |
| Parts Type: | Subdivisions |
| Parts Style: | para |
| Established Title: | Founded |
| Established Date: | December 3, 1917 |
| Seat Type: | Capital |
| Seat: | Aco |
| Leader Title: | Mayor |
| Leader Name: | Tomas Martínez (2019-2022) |
| Unit Pref: | Metric |
| Area Total Km2: | 37.8 |
| Elevation M: | 3480 |
| Population Total: | 1642 |
| Population As Of: | 2017 |
| Population Density Km2: | auto |
| Timezone1: | PET |
| Utc Offset1: | -5 |
| Blank Name Sec1: | UBIGEO |
| Blank Info Sec1: | 120202 |
Aco District is one of fifteen districts of the province Concepción in Peru.[1]