| Tremblay | |
| Native Name: | Kreneg |
| Coordinates: | 48.4231°N -1.4747°W |
| Insee: | 35341 |
| Postal Code: | 35460 |
| Arrondissement: | Fougères-Vitré |
| Canton: | Antrain |
| Commune: | Val-Couesnon |
| Elevation Min M: | 10 |
| Elevation Max M: | 116 |
| Area Km2: | 36.22 |
| Population: | 1483 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Tremblay (in French pronounced as /tʁɑ̃blɛ/;) is a former commune in the Ille-et-Vilaine department of Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Val-Couesnon.[2]
The botanist René Louiche Desfontaines (1750–1833) was born near Tremblay.
Inhabitants of Tremblay are called in French tremblaisiens.