Radical reactions provide a varied and powerful means for transforming carbohydrates. The importance of these reactions has steadily grown over the past several decades. Although the study and investigation of new reactions continue, an increasing amount of effort is directed toward application of radical reactions to synthesis of carbohydrates and carbohydrate-containing materials. Much of this effort is concerned with preparation of biologically active compounds. There is also considerable interest in determining the roles of radical reactions of carbohydrates in living systems. As this turn toward applying and understanding radical reactions in biological settings takes place, the time is right to consolidate what is known about carbohydrate radicals. This consolidation is what takes place in Structure and Reactivity of Carbohydrate Radicals.