Dairago (Lombard: Dairagh or Dairaa [dai̯ˈrɑː(k)], locally [daˈjɑːɡu]) is a comune (municipality) in the Metropolitan City of Milan in the Italian region Lombardy, located about 25 kilometres (16 mi) northwest of Milan.

Dairago borders the following municipalities: Busto Arsizio, Legnano, Magnago, Villa Cortese, Buscate, Busto Garolfo, Arconate.