| San Miguel de Aco | |
| Native Name: | Aqu |
| Native Name Lang: | qu |
| Settlement Type: | District |
| Mapsize: | frameless |
| Subdivision Type: | Country |
| Subdivision Name: |  Peru |
| Subdivision Type1: | Region |
| Subdivision Name1: | Ancash |
| Subdivision Type2: | Province |
| Subdivision Name2: | Carhuaz |
| Parts Type: | Subdivisions |
| Parts Style: | para |
| Established Title: | Founded |
| Established Date: | December 7, 1953 |
| Seat Type: | Capital |
| Seat: | Aco |
| Leader Title: | Mayor |
| Leader Name: | Tomas Severiano Gutierrez Lliuya |
| Unit Pref: | Metric |
| Area Total Km2: | 133.89 |
| Elevation M: | 2925 |
| Population Total: | 2353 |
| Population As Of: | 2005 census |
| Population Density Km2: | auto |
| Timezone1: | PET |
| Utc Offset1: | -5 |
| Blank Name Sec1: | UBIGEO |
| Blank Info Sec1: | 020608 |
San Miguel de Aco District is one of eleven districts of the Carhuaz Province in Peru.[1]
The people in the district are mainly indigenous citizens of Quechua descent. Quechua is the language which the majority of the population (96.98%) learnt to speak in childhood, 2.90% of the residents started speaking using the Spanish language (2007 Peru Census).[2]