| Castilla | |
| Native Name Lang: | es |
| Settlement Type: | District |
| Mapsize: | frameless |
| Coordinates: | -5.1297°N -80.5144°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Peru |
| Subdivision Type1: | Region |
| Subdivision Name1: | Piura |
| Subdivision Type2: | Province |
| Subdivision Name2: | Piura |
| Parts Type: | Subdivisions |
| Parts Style: | para |
| Established Title: | Founded |
| Established Date: | March 30, 1861 |
| Seat Type: | Capital |
| Seat: | Castilla |
| Leader Title: | Mayor |
| Leader Name: | José Elías Aguilar Silva[1] (2019–2021) |
| Unit Pref: | Metric |
| Area Total Km2: | 662.23 |
| Elevation M: | 30 |
| Population Total: | 120,766 |
| Population As Of: | 2005 census |
| Population Density Km2: | auto |
| Timezone1: | PET |
| Utc Offset1: | -5 |
| Blank Name Sec1: | UBIGEO |
| Blank Info Sec1: | 200104 |
| Website: | municastilla.gob.pe |
Castilla District is one of ten districts of the province Piura in Peru.[2] The district was created in 1861 during the presidency of Ramón Castilla. In 2007, it had a population of 120,000.[3]