Structural and dielectric properties of Ba 1−x La x(1−y)/2 Eu xy/2 Na x/2 TiO 3 (0≤x≤0.5) have been investigated. Ceramic samples were elaborated by the classical solid-state routine, they crystallize in the tetragonal distorted perovskite structure for 0≤x≤0.1 and in cubic for 0.1≤x≤0.5. Dielectric measurements showed that the compounds exhibit an evolution from a classical ferroelectric to a relaxor ferroelectric with rising substitution rate x. T C or T m and ε′r decrease when x increases. This study is in the field of preparation of lead-free relaxor ceramics, which have a great importance for the environment.