Tremblay (; ) 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.
The botanist René Louiche Desfontaines (1750âÂÂ1833) was born near Tremblay.
Inhabitants of Tremblay are called in French tremblaisiens.