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Sodium sulphide (Na₂S) nanoparticles are synthesized by hydrothermal method and utilized for electrochemical application for the first time. A series of sodium-ion conducting nanocomposite gel polymer electrolytes (NCGPEs) incorporating poly (methyl methacrylate) i.e., (PMMA) as the polymer backbone, sodium tetrafluoro-borate (NaBF₄) as the salt, tetraethylene glycol dimethyl ether (TEGDME) as the plasticizer, and Na₂S as the active fillers, are fabricated and studied. The optimized electrolyte having PMMA/NaBF₄/TEGDME matrix incorporated with 2.5 wt% Na₂S nanoparticles exhibits a high ionic conductivity of 3.0 × 10⁻⁴ S cm⁻¹, low activation energy of 0.13 eV and operating voltage range of ~2.8 V at ambient temperature. Thermal studies reveal that the fabricated NCGPEs have the ability to retain the gel phase up to 473 K. The X-ray diffraction (XRD) and Fourier transform Infra-red (FTIR) spectroscopy …