Messac (French pronunciation: [mesak]; Breton: Mezeg; Gallo: Meczac) is a former commune in the Ille-et-Vilaine department of Brittany in northwestern France.

On 1 January 2016, it was merged into the new commune Guipry-Messac.

[2] Inhabitants of Messac are called Messacois in French.

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