BackgroundAnorexia nervosa in adolescents can be a difficult-to-treat disease. Because qualitative research is a well-established method for deepening our understanding of subjective experiences, such as eating disorders and their treatment, we sought to perform a systematic review of qualitative studies to synthesize the views of adolescents with this disease, their parents, and their healthcare providers about its treatment.MethodsWe performed a thematic synthesis to develop the central themes that summarize all of the topics raised in the articles included in our review. The quality of the articles was assessed by the Critical Appraisal Skills Program.ResultsWe included 32 articles from seven different countries. Two central themes were inductively developed from the analysis: (1) the treatment targets (i.e., symptoms and patients in context), and (2) a therapeutic tool—a relationship, specifically the core concept of the therapeutic relationship.ConclusionOur results underline the difficulty in establishing a therapeutic alliance, the barriers to it, especially the risk that professionals, adolescents, and parents will not converse about treatment; although such a dialogue appears to be an essential component in the construction of a therapeutic alliance.