This work is aimed to investigate the permeation characteristic of CA/γ-CD-metal organic framework (MOF) based mixed matrix membranes (MMM) for CO2/CH4 separation. The defect-free CA/γ-CD-MOF MMMs with dense, isotropic morphology were fabricated using solution casting method. The fabricated membranes were characterized through Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), ultimate tensile testing, and contact angle measurements. The characterization techniques revealed the uniform dispersion of filler in cellulose acetate matrix and absence of the agglomerates or cracks in the synthesized membrane samples. Moreover, the CO2/CH4 separation performance of fabricated membrane was evaluated using single and mixed gas permeation tests. A general trend of decreasing permeability and selectivity, that is, 36.79�35 of both CO2 and CH4 was observed by increasing the filler weight percentage (0.2�1.0) and pressure (1�5 bar). However, the highest CO2/CH4 selectivity of 38.49 was achieved by CA/γ-CD-MOF 0.4wt MMM. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.