The aim of the current study was to determine the link between parental attachment style and body appreciation in adolescents with and without eating disorders, and to explore the association between attachment, positive aspects of body image and body image quality of life. The sample comprised 260 adolescents (M age = 15.35, SD age = 1.461): 129 non-clinical participants and 131 adolescents with eating disorders who received treatment in five Eating Disorders Units located in different regions in Spain. They were assessed via the Inventory of Parent and Peer Attachment (IPPA), Body Appreciation Scale (BAS), and Body Image Quality of Life Inventory (BIQLI). There was a significant relation between secure attachment and body appreciation in both groups, and body appreciation was positively related to body image quality of life. Patients with eating disorders had higher body image quality of life when they perceived better communication and trust with their father, which was mediated by the body appreciation they showed. Adolescents without eating disorders showed this same relationship form with their mother. This study aims to highlight the influence of parental attachment on a positive body image in adolescence.