Dormelletto is a comune (municipality) in the Province of Novara in the Italian region of Piedmont, located about northeast of Turin and about north of Novara. As of 31 December 2018, it had a population of 2,600 and an area of .
Dormelletto borders the following municipalities: Angera, Arona, Castelletto sopra Ticino, Comignago, and Sesto Calende.