Historically, the topics of religiousness and spirituality have received little attention in the eating disorders field. According to a systematic review of two prestigious eating disorder journals, only about 2% of empirical studies published from 1993 to 2004 included a measure of religiousness or spirituality (Richards & Bartz, 2005). Furthermore, most scholarly books about eating disorders have given scant attention to the possible role of religiousness or spirituality in etiology and treatment. Finally, the most recent eating disorder practice guideline monograph published by the American Psychiatric Association (2006) gives only cursory attention to these topics (Berrett, Hardman, & Richards, 2010).Fortunately the neglect of religiousness and spirituality in the eating disorders field appears to be waning as a growing number of studies on this topic have been published recently in professional journals as well as several books and book chapters, all of which are discussed in this chapter. Also, according to an exhaustive Internet search, more than 40% of eating disorder facilities in North America now advertise that they address patients' spiritual needs in their treatment programs (Susov & Richards, 2010).We hope that this chapter will help stimulate further theory, research, and effective practice in this important domain. We begin by providing brief background information about eating disorders, followed by a review of theoretical and empirical evidence that religiousness and spirituality may play a role in the etiology of eating disorders. We also review studies that indicate that religiousness and spirituality may play an important part in eating disorder treatment and recovery. We discuss recent clinical literature that provides insight and guidelines into how to implement spiritual perspectives and interventions during treatment. We conclude by offering some recommendations for future research, training, and practice.Consistent with the integrative paradigm of this handbook, we use the term religiousness in this chapter to refer to beliefs, practices, relationships, or experiences having to do with the sacred that are explicitly and historically rooted in established institutionalized systems (see Volume 1, Chapter 1, this handbook). Many eating disorder patients, similar to the general public, are affiliated with a specific religious denomination, and their beliefs about the sacred are directly grounded in the teachings of their denomination. We use the term spirituality to refer to beliefs, practices, relationships, or experiences having to do with the sacred that are not necessarily linked to established institutionalized systems (see Volume 1, Chapter 1, this handbook). Other eating disorder patients have never been, or no longer are, affiliated with a formal religious denomination, but nevertheless they regard themselves as spiritually inclined with interests in the sacred or divine. In this chapter, we frequently use both terms together because we wish to include both types of patients and bo...