Inspite of the large volumes of the Moroccan table olive production and also exportations, the nutritional and the chemical characterizations of the Moroccan fermented olives are very scarce. To our knowledge, the chemical changes occurring during fermentation of Moroccan olives from Moroccan Picholine, Languedoc Picholine, Sevillana and Ascolana, which are the predominant cultivars in Morocco, were not yet investigated.