| Châteaubourg | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Châteaubourg (Ille-et-Vilaine).svg |
| Coordinates: | 48.1119°N -1.4019°W |
| Insee: | 35068 |
| Postal Code: | 35220 |
| Arrondissement: | Fougères-Vitré |
| Canton: | Châteaugiron |
| Mayor: | Teddy Régnier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Vitré Communauté |
| Elevation Min M: | 35 |
| Elevation Max M: | 117 |
| Area Km2: | 28.60 |
Châteaubourg (in French pronounced as /ʃatobuʁ/; ; Gallo: Chastèu-Bórg) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
Inhabitants of Châteaubourg are called Castelbourgeois in French.