Giumaglio is a village and former municipality of the district of Vallemaggia in the canton of Ticino, Switzerland.
On 4 April 2004 the former municipalities of Aurigeno, Coglio, Giumaglio, Lodano, Moghegno and Someo merged into the new municipality of Maggia.
46°16′N 8°40′E / 46.267°N 8.667°E / 46.267; 8.667