The Mediterranean has an average annual population growth rate of around 1%, which is about the same as the world population growth rate. With a few rare exceptions, this growth is not principally fuelled by migration flows. However, it is closely linked to the demographic transition still underway in many Southern and Eastern Mediterranean Countries, i.e. by the excess of births over deaths (natural balance). In these countries, average annual natural change of about 1.6% (higher than the world average and a fortiori that of the Mediterranean as a whole) have been observed. This chapter gives an account of the evolution of the differentiated growth rates of the populations of the Mediterranean region since the 1950s, distinguishing between the development of natural, migration and overall growth rates. This will make it possible to characterise the countries whose growth has been stimulated more by natural than migration growth depending on the period, thus heralding the sustainability of future growth rates. To achieve this, the chapter will propose a ranking of growth rates for different countries over time, as well as the expected developments in terms of projections while discussing the assumptions.