In recent year, Mn₂O₃ nanomaterials exhibit a high surface area, narrow pore size distribution, large pore volume, and high thermal stability. MnO_x materials have shown promising candidates for active electrode materials for various electrochemical systems like fuel cells, supercapacitors etc., due to their high specific capacitance, low cost, abundance and environmentally benign nature. In this work, the mesoporous Mn₂O₃ nanoparticles (NPs) were synthesized by manganese acetate, citric acid and sodium hydroxide through hydrothermal process at 150 ^oC for 3h. The synthesized mesoporous Mn₂O₃ NPs were characterized in terms of their morphology, surface, crystalline, electrochemical and electrochemical properties. For supercapacitor applications, the synthesized mesoporous Mn₂O₃ NPs based electrode showed the excellent specific capacitance (C_sp) of 460 Fg⁻¹ through good electrocatalytic activity by observing good electrochemical properties in 6M KOH. Excellent C_sp might be explained by the facts in improving the surface area, porous surface and uniformity, which might favor in generating large active sites and fast ionic transport over the good electrocatalytic surface of the Mn₂O₃ electrode. The fabricated supercapacitors exhibited good cycling stability after 1000 cycles by maintaining ~ 86% of initial C_sp.