In this paper, a series of zinc cobaltite catalysts with the general formula Znx-Co₁-xCo₂O₄ (x = 0.25, 0.50, 0.75 and 1.0) has been prepared using the co-precipitation method. Thermal analyzes (TGA and DTA) were used to follow up the thermal events accompanying the heat treatment of the parent mixture. Based on these results, the various parent mixtures were calcined at 500℃. The obtained solid catalysts were characterized by using XRD, FT-IR and N2-adsorption. The catalytic decomposition of N₂O to N₂ and O₂ was carried out on the zinc-cobaltite catalysts. It was found that partial replacement of Co²⁺ by Zn²⁺ in Co₃O₄ spinel oxide led to a significant improvement in their N₂O decomposition activity. Moreover, the catalytic activity was found to be depended on the calcination temperature utilized.