Membrane pervaporation has shown many advantages over distillation for separation of water/organics mixtures since not only it requires a low energy demand but also it provides the ability to separate azeotropic mixtures. Zeolite membranes might show better thermal, mechanical, chemical stabilities than polymer membranes. Water could be effectively separated from water/organic mixtures using the NaY zeolite membrane because of its high hydrophilicity. In this study, water was separated from water/ethanol mixtures by pervaporation using NaY zeolite membrane synthesized in our laboratory. As a mole fraction of ethanol increased, a total permeation flux decreased and a separation factor also decreased. As an experimental temperature increased, a total permeation flux increased while a separation factor decreased. It was found that the NaY zeolite membrane showed better performance on water/ethanol separation than that of a distillation process or PVA polymeric pervaporation membranes.