Tremblay (French pronunciation: [tʁɑ̃blɛ]; Breton: Kreneg) 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.

This Ille-et-Vilaine geographical article is a stub.