In this work, the effects of incorporating perovskite nanoparticles into polyvinylidene fluoride (PVDF) and polysulfone (PS) flat sheet membranes were evaluated in detail. perovskite nanoparticles were added in a low amount (1 wt.%) to the casting solution to fabricate nanocomposite membranes with the non-solvent induced phase separation method. Prepared membranes were characterized using atomic force microscopy (AFM), scanning electron microscopy-energydispersive X-ray spectroscopy, and contact angle techniques. AFM images demonstrated that perovskite-embedded membranes had smoother surfaces than neat PVDF and PS membranes. Contact angle measurement showed that the hydrophilicity of PVDF and PS membranes was improved by adding nanoparticles. Results revealed that the presence of perovskite nanoparticles in the matrix of the membrane improves pure water flux from 58.0 (neat PVDF) and 44.9 (neat PS) to 66.1, 71.8, 56.3, and 64.5 L/m2 & BULL;h for PVDF/LaSrCuMn, PVDF/LaSrCuMn-Pd, PS/LaFeMn, and PS/LaFeMn-Pd nanocomposite membranes, respectively. The fouling behavior of prepared membranes was ascertained by filtration of humic acid solution. Investigation of antifouling performance showed that nanocomposite membranes have higher fouling resistance. Finally, it was found that nanocomposite membranes can be used efficiently to filter humic acid.