| Castirla | |
| Commune Status: | Commune |
| Arrondissement: | Corte |
| Canton: | Golo-Morosaglia |
| Insee: | 2B083 |
| Postal Code: | 20236 |
| Mayor: | Jacques-André Tomasini[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 42.3733°N 9.1447°W |
| Elevation M: | 450 |
| Elevation Min M: | 298 |
| Elevation Max M: | 1951 |
| Area Km2: | 24.32 |
Castirla (in French pronounced as /kastiʁla/) is a commune in the Haute-Corse department of France on the island of Corsica.
Castirla has a hot-summer mediterranean climate (Köppen climate classification Csa). The average annual temperature in Castirla is . The average annual rainfall is with December as the wettest month. The temperatures are highest on average in July, at around, and lowest in January, at around . The highest temperature ever recorded in Castirla was on 19 July 2023; the coldest temperature ever recorded was on 10 January 1981.