It is well known that commercial ceramic membranes are still more expensive than polymeric ones not only due to the use of costly industrial oxides such as alumina, titania and silica but also these oxides often require higher sintering temperatures which increases the consumption of energy. Last decades, efforts have been devoted to the preparation of low-cost ceramic membranes made from geomaterials like clay, perlite, phosphate and others. In particular, natural pozzolan is a cheaper and abundant geomaterial that is essentially composed of primarily silica and alumina oxides that can be employed for preparation of commercial ceramic membranes. Therefore, natural pozzolan could be considered as an alternative for fabrication of low-cost membranes. The main concern of this chapter is to highlight features and advantages of pozzolan-based membranes for different membrane processes including microfiltration, ultrafiltration as well as pervaporation. The present chapter reviews the current status on pozzolan-based microfiltration membranes with tubular and flat configurations prepared via dry and wet routes for the pretreatment of seawater prior reverse osmosis process and clarification of wastewater generated from industries such as textile and tannery. Deep insights into the preparation of pozzolan-based composite ultrafiltration membranes (namely reduced graphene oxide, polysulfone/polyetherimide and purified clays), aimed for removal of soluble dyes, are reviewed as well. In addition, the use of a low-cost membrane made of pozzolan and NaA zeolite for dehydration of alcohols solutions thought pervaporation process is discussed. Finally, potentialities and challenges of pozzolan-based membranes are proposed.