Membrane technology had been used extensively for the separation ofdifferent gases. Among different types of membranes, mixed matrix membranescomprising of inorganic fillers and the polymer matrix, have gainedenormous importance in recent years due to the synergic benefits fromboth the components. Among different inorganic fillers, silica is the mostextensively used. In the present paper, a comprehensive discussion is givenon the available research works in nanosilica-polymer composite basedmixed matrix membranes. The discussion includes different fabricationmethods as well as various characterization techniques and applicationsfor the membrane system.