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Janzé (Breton: Gentieg, Gallo: Janzae) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France. It is also the seat of the Canton of Janzé.
The inhabitants of Janzé are called Janzéens in French.
Early historical evidence points to the settlement of the area by Gallic tribes before the Roman occupation. Two Christian parishes were established in the 11th and 13th centuries.
After the French Revolution, Janzé became an important center of agriculture and commerce and is currently well known for its poultry industry.
Among its sites of interest are two official French Historical Monuments (Monument Historique): the menhir called The Fairies' Rock (La Pierre des Fées) and the Church of Saint Martin (Eglise Saint-Martin).