This book discusses some of the reduction agents and processes involved in organic synthesis such as catalytic hydrogenation, homogeneous catalytic hydrogenation, asymmetric catalytic hydrogenations, hydride transfer reagents, dissolving metal reductions, and non-metallic reducing agents. It further covers the topics of photochemical reductions, enzymatic or microbial reduction, reductions of specific type of organic compounds including hydrocarbons, hydrogenolysis, enzymatic or microbial reduction, and some reductions under benign condition. This book is of immense use to undergraduate and postgraduate students of organic chemistry. It is also a useful reference book for researchers involved in organic synthesis.