Summary: Al–doped MnO₂ nanoparticles were synthesized and characterized using XRD, SEM, TEM, EDX, and UV-Vis spectroscopy. Structural analysis confirmed a tetragonal MnO₂ phase, with crystallite sizes between 49.75 nm and 92.71 nm. Morphological studies revealed uniformly distributed nanoparticles with sizes ranging from 13.34 nm to 22.23 nm. EDX analysis validated the successful incorporation of aluminum, while optical characterization indicated a direct bandgap of 3.79 eV, suggesting potential optoelectronic applications. The enhanced conductivity and catalytic activity of Al-doped MnO₂ highlight its promising applications in supercapacitors, energy storage, and photocatalysis.