The specific heat of NpGa3 has been measured for the first time. The magnetic transitions and more generally the full magnetic phase diagram have been re-established precisely. The Sommerfeld coefficient and the magnetic entropy point to a rather localized system, in agreement with previous studies, in particular high pressure Mössbauer and resistivity. The comparison with other NpX3 suggests that NpGa3 is the most localized member of the series. ; JRC.E.6-Actinides research