| Castelnou | |
| Commune Status: | Castellnou dels Aspres |
| Image Coat Of Arms: | Blason ville fr Castelnou (Pyrénées-Orientales).svg |
| Arrondissement: | Céret |
| Canton: | Les Aspres |
| Insee: | 66044 |
| Postal Code: | 66300 |
| Mayor: | Michel Huge[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Aspres |
| Coordinates: | 42.6206°N 2.7031°W |
| Elevation Min M: | 111 |
| Elevation Max M: | 444 |
| Area Km2: | 19.28 |
| Demonym: | castelnouvois (fr) castellnoví (ca) |
Castelnou (pronounced as /fr/; ca|Castellnou dels Aspres pronounced as /ca/) is a commune in the Pyrénées-Orientales department in southern France.
Castelnou is located in the canton of Les Aspres and in the arrondissement of Perpignan.
It is part of the Northern Catalan comarca of Rosselló. It is located within the subcomarca of, with the northern area of the commune being part of .