Ba0.975Ho0.017(Zr0.20Ti0.75)Sn0.05O3 (abbreviated BHZ20TS) was elaborated by solid-state reaction at high temperature. The X-ray diffraction pattern, refined by the Rietveld method, indicated that the ceramic has a perovskite structure with a cubic symmetry. The Scanning electron microscopy revealed a high density and low porosity with reduced particle sizes upon substitution ofBa2+ by the rare earth ion Ho3+. The dielectric study as a function of temperature (-150 – 200 °C) and frequency (102 - 106 Hz) showed relaxor ferroelectric behavior. The modified Curie-Weiss law allowed us to evaluate the diffuse phase transition parameters. BHZ20TS obeys the empirical Vogel–Fulcher relation which confirms the relaxor behavior of this composition. With an optical band gap of 2.56 eV, BHZ20TS is attractive for photocatalytic applications. The capacitance-potential (C-2 - E) characteristic plotted in Na2SO4 (0.1 M) indicates n type behavior with a flat band potential (Efb) of -0.60 VSCE and electronic density (NA) of 2.2×1016cm-3. The semicircle in the Electrochemical Impedance Spectroscopy (EIS) measured in the range (10-3 – 105 Hz) is ascribed to the bulk material BHZ20TS (80 kW cm2) with a constant phase element (CPE) and a depletion angle of -5°. As application, the oxide was tested with success for the photooxidation under solar light of Bezacryl (BEZ), a hazardous dye. The energy band diagram shows an electron transfer from the conduction band of BHZ20TS to dissolved oxygen, generating O2· and OH·- radicals, responsible of the BEZ mineralization whose disappearance was followed by UV-Vis spectrophotometry. An abatement of 60% is obtained in BEZ solution (10 mg L-1) within 100 min under a solar irradiance of 97 mWcm-2; the mineralization obeys a first order kinetic model with a half photocatalytic life of 57 min.