The growth of nanotechnology has sparked a new wave of interest in membrane technologies, particularly due to the invention of nanocomposite membranes. ZIF-8, a subclass of MOF materials known for its chemical and thermal stability, was incorporated into polysulfone (PSU) ultrafiltration membranes for the removal of oil from water. Nanocomposite PSU-ZIF-8 membranes were prepared by adding varying amounts of ZIF-8 nanoparticles (0.025, 0.05, and 0.075 wt%) into the polymeric PSU solution. The membranes were characterized by contact angle (CA), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), and porosity analysis. The highest porosity, 70%, was observed for the PSU/ZIF-8-0.05wt.% membrane. The porosity was used to assess the membrane's performance in terms of fluid passage and selective filtration efficiency. Membranes with and without ZIF-8 were tested for flux and oil rejection. The PSU membrane without ZIF-8 showed a flux of 50 L/m²·h and 86% oil rejection. With the addition of ZIF-8, the flux increased, with the PSU/ZIF-8-0.025wt.% membrane achieving 53.57 L/m²·h and 87% oil rejection. Performance continued to improve with higher ZIF-8 concentrations, with peak performance reached at 0.05 wt.% ZIF-8, which resulted in enhanced flux and oil rejection efficiency.