In this study, titanium dioxide nanoparticles (TiO$_2$-NPs) were synthesized via a green, cost-effective method using Azadirachta indica leaf extract as a natural capping and reducing agent. Characterization techniques including UV-vis, FTIR, XRD, SEM, EDX, and PL spectroscopy confirmed successful synthesis. UV-vis and FTIR confirmed surface functionalization by organic residues, while XRD revealed a well-crystalline anatase phase with average crystallite sizes of 42.2--54 nm. SEM analysis showed predominantly spherical particles (70--90 nm), and EDX confirmed high purity with only Ti and oxygen present. PL spectra exhibited emission peaks at 420, 468, 493, and 539 nm. The green TiO$_2$-NPs... More >