Cremenaga is a comune (municipality) in the Province of Varese in the Italian region Lombardy , located about 60 kilometres (37 mi) northwest of Milan and about 20 kilometres (12 mi) north of Varese, on the border with Switzerland. As of 31 December 2004, it had a population of 780 and an area of 4.6 square kilometres (1.8 sq mi).

The municipality of Cremenaga contains the frazioni (subdivisions, mainly villages and hamlets) Sasso del Castello, Mirabello, Campagna, Monte Sette Termini (i Bedeloni), and Cascina Porsù.

Cremenaga borders the following municipalities: Cadegliano-Viconago , Cugliate-Fabiasco , Luino, Monteggio (Switzerland), Montegrino Valtravaglia.