In 1994, binge eating disorder (BED) was introduced as a disorder requiring further study in the "American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders", fourth edition ("DSM-IV"). It is now listed as a distinct eating disorder in the "DSM-5", along with bulimia nervosa and anorexia nervosa. This article summarizes the information currently available on BED, so social workers will be knowledgeable as they work with clients with obesity, BED, and other eating disorders. Diagnostic criteria for BED are reviewed, as well as changes in the criteria since the diagnosis was first introduced. Prevalence estimates, available assessment instruments, and comorbidity are discussed. An overview of the systematic reviews and meta-analyses that have examined the treatment of clients meeting the criteria for BED is presented, and, finally, questions and issues that have been suggested for future research are offered.