| Casarilh | |
| Native Name: | Casarill |
| Settlement Type: | village |
| Pushpin Map: | Spain Catalonia |
| Pushpin Map Caption: | Location in Catalonia |
| Coordinates: | 42.6997°N 0.8308°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Lleida |
| Subdivision Type3: | Special division |
| Subdivision Name3: | Val d'Aran |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Vielha e Mijaran |
| Elevation M: | 1,050 |
| Population Footnotes: | [1] |
| Population Total: | 84 |
| Population As Of: | 2020 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 25538 |
| Blank Name: | Climate |
Casarilh (in Occitan (post 1500); pronounced as /kazaˈɾiʎ/)[2] is a village located in the municipality of Vielha e Mijaran, in the Val d'Aran.
The village of Casarilh is located on the left bank of the Garonne, at the eastern end of the municipality, at an altitude of 1050 m. The village, with 84 inhabitants in 2020,[3] is crossed by the old Camin Reiau, parallel to the C-142 road, which surrounds it at noon. The nucleus, with a very simple structure, is presided over by the parish church of Sant Martí, of Romanesque origin, with a massive bell tower and a late Roman tombstone.[4]