Menzonio is a village and former municipality in the district of Vallemaggia in the canton of Ticino, Switzerland .

In 2004 the municipality was merged with the other, neighboring municipalities Broglio, Brontallo , Fusio , Peccia and Prato-Sornico to form a new and larger municipality Lavizzara .

Menzonio is first mentioned in 1364 as Menzone. Until the beginning of the 15th century, Menzonio and Brontallo formed a single municipality, and together with Bignasco and Cavergno it formed a Vicinanza which was under the jurisdiction of the Lavizzara valley. At the time of the Swiss Confederation rule over Ticino, Menzonio was one of seven villages in the valley. The village church was part of the parish of Cevio until 1513 when it split away to form a parish with Brontallo.