A variety of organic reactions are catalyzed in a very selective manner by base catalysts. Especially, solid bases offer convenient and environmentally-benin routes for organic synthesis. This review overviews the recent development on the catalysis by solid bases. The catalytic materials described are zeolites, modified zeolites, alkaline earth oxides, alkali metals on supports, KNH2 on alumina, KF on alumina, hydrotalcites and oxynitrides. Stress are also placed on novel reactions catalyzed by the solid bases. The reactions include isomerization of alkenes, reactions of alkynes, methylations, addition reactions, Knoevenagel condensations, reactions of silanes.