| San Antonio District | |
| Native Name: | Chaqlla |
| Native Name Lang: | que |
| 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 |
| Established Date: | January 5, 1945 |
| Seat Type: | Capital |
| Seat: | Chaclla |
| Leader Title: | Mayor |
| Leader Name: | Nick Aponte (2023 - 2026) |
| Unit Pref: | Metric |
| Area Total Km2: | 563.59 |
| Elevation M: | 3438 |
| Population Total: | 1690 |
| Population As Of: | 2005 census |
| Population Density Km2: | auto |
| Timezone1: | PET |
| Utc Offset1: | -5 |
| Blank Name Sec1: | UBIGEO |
| Blank Info Sec1: | 150716 |
San Antonio de Chaclla is one of the thirty-two districts of the province of Huarochirí, in the Department of Lima, in Peru. It borders to the north with the districts of Santa Rosa de Quives and Arahuay, both belonging to the province of Canta; to the east with the districts of Huachupampa, San Pedro de Casta, and Santa Eulalia; to the south with the district of Lurigancho-Chosica, province of Lima; and to the west with the districts of San Juan de Lurigancho and Carabayllo, both belonging to the province of Lima.[1]
Historically, the district is known as San Antonio de Chaclla since the founding of the town of Chaclla, located at 3,420 meters above sea level in the upper basin of the Santa Eulalia River. Within the ecclesiastical division of the Catholic Church of Peru, it belongs to Vicariate IV of the Diocese of Chosica. The district was created by Decree Law No. 10161 on January 5, 1945, during the first government of President Manuel Prado Ugarteche.
It covers an area of 563.59 km² and has a population of 37,961 inhabitants according to RENIEC.
In its territory, there are conflict zones bordering some districts of the province of Lima, such as: Annexes 4 (end of Los Jardines Este avenue), 22 (Beyond Montenegro), and 2 (Campoy hills and part of Huachipa) of the peasant community of Jicamarca, which are areas in dispute with the district of San Juan de Lurigancho. Likewise, there is annex 8 (Huachipa), which is the area in conflict with the Lurigancho-Chosica district.
Its de facto capital is annex 8 of Jicamarca. According to the fact that the Jicamarca peasant community legally sold by sectors: (El Cercado 350 hectares, Pedregal, Las Lomas 240 hectares, La Chancadora 200 hectares, El Palomar, El Valle 1, San Isidro 26 hectares, Ana Yauri 1000 hectares and others) in the years 1999 to 2002, as recorded in items registered in SUNARP.