BaBi 4 Ti 4 O 15 (BBT) ceramic was synthesized using mixed oxide route and the structural and electrical properties were investigated systematically. The structural studies confirmed it to be an n=4 member of the Aurivillius oxide. A broad dielectric peak with frequency dependent dielectric maximum temperature was observed. The dielectric relaxation obeyed the Vogel–Fulcher relation wherein f 0 =8.37E+14Hz, E a =0.13eV, and T f =608.18K. The diffuseness parameter γ established the relaxor nature and it was attributed to the A-site cationic disorder. The specimen exhibited the excellent reproducibility in the measurements of displacement current, a remnant polarization of 5.4μC/cm 2 , and a coercive field of 4.03MV/m. The room temperature piezoelectric coefficient d 33 was found to be 23pC/N and the field-induced strain S was about 0.018% at the 8MV/m electric field.