Geomagnetism has always been at the forefront among the various branches of geophysics. Nevertheless generally geophysics and space physics textbooks and courses devote little parts specifically to the ground rules of this discipline. On the other side ionospheric physics, although a fundamental part of atmospheric science, has been for many years devoted especially to the investigation of problems related to radio wave communications and propagation. Geomagnetism and ionospheric Physics are instead at the basis of several forefront problems in Earth science. In this course the fundamental subjects of geomagnetism: the Earth’s magnetic field, the magnetic properties of rocks, measuring and interpreting magnetic anomalies and the elements of the complex aspects of the geomagnetic dynamo and reversals will be addressed. For what concerns the ionosphere, the physics underneath, the radio propagation and prediction, as well as its variability, and satellite applications, will be discussed. One common item will be ‘space weather’ that is intrinsically related both to geomagnetism and ionosphere. In this course we have gathered experts in these fields that can show the several aspects in which geomagnetism and ionosphere physics deal with as an essential part of Earth science education.