This study investigates the structural, optical, and magnetic properties of Ni0.5Zn0.5Fe2O4 nanoparticles calcined at different temperatures, i.e., 450 ℃, 600 ℃, and 750 ℃. X-ray diffraction (XRD) analysis confirmed the formation of a single-phase cubic spinel structure. The lattice parameter obtained from Rietveld refinement is decreased from 8.373 Å to 8.357 Å as the calcination temperature increased from 450 ℃ to 750 ℃. UV-visible spectroscopy was employed to estimate the optical band gap of the material, revealing its potential for optoelectronic applications. Magnetic characterization through M-H loop measurements elucidated the ferromagnetic behaviour of the nanoparticles. The magnetic properties exhibited interesting trends with calcination temperature: coercivity (Hc) and remanence (Mr) decreased from 83.5 Oe to 46.4 Oe and 5.46 emu/g to 2.78 emu/g, respectively, indicating softer magnetic behaviour at higher calcination temperatures. The combined analysis of structural, optical, and magnetic properties offers a comprehensive understanding of Ni0.5Zn0.5Fe2O4, highlighting its potential for various technological applications in fields such as spintronics, magnetic storage, and catalysis.