| Dumenza | |
| Official Name: | Comune di Dumenza |
| Coordinates: | 46.0167°N 55°W |
| Region: | Lombardy |
| Province: | Varese (VA) |
| Frazioni: | Runo, Due Cossani, Stivigliano, Trezzino |
| Mayor: | Corrado Nazario Moro |
| Area Total Km2: | 18.5 |
| Population Footnotes: | [1] |
| Population Total: | 1376 |
| Population As Of: | December 2004 |
| Population Demonym: | Dumentini |
| Elevation M: | 411 |
| Postal Code: | 21010 |
| Area Code: | 0332 |
Dumenza is a comune (municipality) in the Province of Varese in the Italian region of Lombardy, located about 70km (40miles) northwest of Milan and about 25km (16miles) north of Varese, on the border with Switzerland.
The municipality of Dumenza contains the frazioni (subdivisions, mainly villages and hamlets) Runo (birthplace of painter Bernardino Luini), Due Cossani, Stivigliano, and Trezzino.
Dumenza borders the following municipalities: Agra, Astano (Switzerland), Curiglia con Monteviasco, Luino, Maccagno con Pino e Veddasca, Miglieglia (Switzerland), Monteggio (Switzerland), Novaggio (Switzerland), Sessa (Switzerland).