| Fontenelle-Montby | |
| Commune Status: | Commune |
| Coordinates: | 47.4503°N 6.415°W |
| Insee: | 25247 |
| Postal Code: | 25340 |
| Arrondissement: | Besançon |
| Canton: | Baume-les-Dames |
| Mayor: | Pierre Rupp[1] |
| Term: | 2022 - 2026 |
| Intercommunality: | Deux Vallées Vertes |
| Elevation Min M: | 394 |
| Elevation Max M: | 470 |
| Area Km2: | 6.65 |
Fontenelle-Montby is a commune in the Doubs department in the Bourgogne-Franche-Comté region in eastern France.