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A straightforward, non-toxic, economical, and environmentally safe method for nanoparticle (NP) synthesis is NP biosynthesis. An aqueous extract of the green husk of <i>Juglans regia</i> (<i>J. regia</i>) was used to produce titanium dioxide NPs (TiO₂ NPs) in this study. The green husk of walnuts is an agricultural waste that may contain valuable compounds. Numerous studies have demonstrated the potential of this inexpensive natural material as a source of phenolic compounds with antiradical and antimicrobial properties. The NPs were characterized using UV-Vis spectroscopy, X-ray diffraction, FT–IR spectroscopy, DLS, and FE-SEM. The UV–Vis spectrum displayed a significant peak at 334 nm. The as-fabricated TiO₂ NPs had two distinct phases that ranged in size from 19 to 23 nm on average. FT-IR analysis revealed the Ti-O bond. FE-SEM and EDX were used to characterize the spherical surface morphology and the Ti and O elemental configuration of the NPs, respectively. TiO₂ NPs are viewed as incredibly important nanomaterials as a result of their security, high strength, and photocatalytic properties. Accordingly, TiO₂ NPs are valuable in beauty-care products, substance detection, wastewater treatment, antimicrobial applications, hydrogen creation, and lithium-ion batteries.