| Castelnau-Picampeau | |
| Commune Status: | Commune |
| Arrondissement: | Muret |
| Canton: | Cazères |
| Insee: | 31119 |
| Postal Code: | 31430 |
| Mayor: | Christian Cazalot[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.3072°N 1.0192°W |
| Elevation M: | 380 |
| Elevation Min M: | 252 |
| Elevation Max M: | 381 |
| Area Km2: | 11.3 |
Castelnau-Picampeau (in French pronounced as /kastɛlno pikɑ̃po/; Occitan (post 1500);: Castèthnau Picampau) is a commune in the Haute-Garonne department in southwestern France.