Dielectric and impedance spectroscopies were employed to study the electrical behavior of (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 (abbr. BCTZ) lead-free ceramic. The dielectric properties versus dc bias electric field experiment revealed high dielectric tunability (> 65%) as well as figure of merit (> 27) at 10 kHz and room temperature. At elevated temperature range, a dielectric loss peak was observed and verified to be correlate of oxygen vacancy relaxation. The impedance spectra studies indicate that the ceramic is a mixed ionic conductor of p-type nature at the paraelectric phase and, the grain and total conductivity at 600°C reaches 6.0 × 10−5 and 2.0 × 10−5 S/cm, respectively.