ABSTRACT. – From March 2008 to February 2010, 2,013 two banded sea bream Diplodus vulgaris (Sparidae) ranging from 5.5 to 25.8 cm in total length (TL), fished in the Gulf of Gabes (south Tunisia, central Mediterranean Sea), were used to investigate feeding habits of the species. This study was based mainly on the variation of the index of relative importance (IRI) with respect to sex, fish size and season. Among 2,013 stomachs examined, 1,374 were empty (vacuity index: %VI = 68.26). This index (% VI) differed significantly across months and declined slightly among the seasons. A total of 22 species representing eight different families belonging to three major groups: molluscs, crustaceans, and echinoderms, were identified in stomach contents of Diplodus vulgaris. This species is primarily a generalist carnivorous fish with a diet consisting of a wide range of species. Molluscs were found in the majority of stomachs, with a total relative importance (% IRI) of 59.06%. The Pectinids were the most important bivalve family (% IRI = 8.49), while crustaceans were the second most important food category consumed (19.07 %). There were significant differences in the diet between males and females through the seasons and between juveniles and adults.