Zeolite membranes are drawing attention in membrane science because of the unique characteristics of zeolite in areas such as ion exchange, catalysis, adsorption and molecular sieving. The synthesis of zeolite membrane and their applications to pervaporation are reviewed. Emphasis is placed upon the relation between the conditions of hydrothermal synthesis and membrane performances of pervaporation of water/organic liquid mixtures. Possible transport mechanisms through the membranes for separation are outlined and their potential applications in membrane reactors are also discussed.