n the present work, we studied the effect of the substitution of BaO by Pr6O11, on the structure, dielectric and electrical properties of BaTiZrO5 ceramics. Samples of general formula (99.2-x) Bao-xPr6O11-0.5TiO2-0.3ZrO2 (x =0.1, 0.2, 0.5 and 0.6) named P1, P2, P3 and P4 respectively were prepared by conventional ceramic method. The structure of the prepared samples was studied using X-ray diffraction, water absorption % and SEM. Addition of Pr6O11 minimized the presence of closed pores and thus led to improved densification. The crystallize size of the prepared samples was calculated and found in the range 22-26 nm. The effect of the substitution by Pr6O11 on breakdown field, dielectric constant, ac resistivity was investigated. Finally, it was found that, the substitution BaO by Pr6O11 improves the physical properties of BaTiZrO5 ceramics by increasing their break down field, ac resistivity and dielectric constant that makes these ceramics useful in the technological applications.