On the island of Sardinia, at least since the Middle Neolithic age, megalithism reaches its peak (end of Neolithic and first phase of Eneolithic) and will develop further till Bronze age. Sardinia excels indeed displaying quite a lot of megalithic monuments, such as circles, dolmens, menhirs, statue-menhirs. Recent researches have highlighted tight structural relationships between the megalithic monuments of the island and some extra-insular regions, as the Iberian Peninsula, France and chiefly Corsica. We can infer then that Sardinia was not a cut-off region, with only scarce relations with other areas, but that, on the contrary, it had to make part of the whole Western region of the Mediterranean basin during the prehistoric age. This contribution intend to offer the most outstanding testimonies of the megalithic phenomenon in Sardinia, linking it to the chronological and areal corrispondences of the western Mediterranean region.