Magnetic properties of the principal lithologies of the Ivrea Zone of northern Italy have been measured. Maficultramafic granulite facies rocks and amphibolites from the granulite-amplibolite facies transition zone are highly magnetic with susceptibilities greater than 0.5¿10-3 (cgs) saturation magnetization values greater then ~90¿10-3 emu/cm3 and Curie points between 570¿ and 580¿C. The magnetic phase is magnetite. All other lithologies are moderately to weakly magnetic. The magnetic mafic granulites are thick and laterally continuous and, thus, would make an appropriate deep crustal source for long wavelength magnetic anomalies in regions typified by low to average geothermal gradients.