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This study focused on the green synthesis of Fe₃O₄/Chitosan (Cs) nanocomposites using Moringa oleifera leaf extract, which showed good photocatalytic activity when exposed to ultraviolet (UV) irradiation. X-ray diffraction spectrum of Fe₃O₄/Cs informs the cubic inverse spinel and has crystallite size in the 10.1 – 11.7 nm range. The crystallite size also increased with the increase of Cs mass. The morphology of Fe₃O₄ and Fe₃O₄/Cs was nearly spherical. The transmission electron microscope showed the most uniform size of nanocomposites at around 17.1 nm. The Fourier transform infrared spectrophotometer result identified Fe-O in the 576–583 cm⁻¹ range, indicating that Fe₃O₄ successfully bonded to Cs. Other functional groups, including O–H, C–H, C–O, C–O–C, and NH₂, were also found, indicating that the formation of Cs was effective. The element composition of Fe₃O₄ is Fe (70.9 %) and O (29.1 …