Using the solid-state method, we were synthesized ZnO/ZnNb₂O₆ composite. The elaborated composite was characterized by X-ray diffraction and impedance spectroscopy. The XRD patterns show the co-existence of a hexagonal ZnO and an orthorhombic ZnNb₂O₆ structures. Then, the dielectrically properties were investigated at room temperature in a wide range of frequencies (from 20 Hz to 1MHz). Moreover, the composite nyquist curve revealed the contribution of grain and grain-boundaries. Indeed, theoretical fit exhibits high resistance, capacitive behavior, high permittivity and low loss factor. So this composite is a good candidate for super capacitor for energy storage application.