Malvaglia is a former municipality in the district of Blenio in the canton of Ticino in Switzerland . Since 15 March 2011, it is part of the municipality Serravalle. The reservoir Bacino di Val Malvaglia is located above the village of Malvaglia.

Malvaglia is first mentioned in 1205 as de Malvallia. In German it used to be known as Manglia. Malvaglia's development and history is closely tied to the development and history of the Blenio valley.