Sodium borohydride has long been the reagent of choice for the reduction of aldehydes and ketones to the corresponding alcohol. The fact that it will also reduce acid chlorides, peroxides, Schiff bases, quaternary halides and many other functional groups is less familiar to many organic chemists. Conversion to other borohydrides or to diborane extends the usefulness of NaBH₄ to the reduction of acids, esters, olefins and other functional groups normally reducible only by lithium aluminum hydride. The purpose of this brochure is to show the wide utility of NaBH₄ in organic chemistry. Selected references are included to permit the reader to obtain more details on particular reactions, should he want them. The references are by no means complete; they are intended only to be illustrative. Where less accessible journals are cited, the appropriate Chemical Abstracts reference is also included. As a guide to NaBH₄'s position in organic reduction, a table of common functional groups and their reducibility by a number of hydride reducing agents is included.