Background: Obsessive-compulsive disorder (OCD) affects the lives of both patients and their relatives. Clinical observations suggest that family members of patients with OCD are involved in the patients' rituals, often impairing their own everyday life. Objective: The objective of this study was to compare the quality of life (QoL) of relatives of patients with OCD with that of the general German population. Methods: Seventy-four relatives (29 parents, 33 spouses, 8 children, and 4 siblings) of patients with OCD (International Statistical Classification of Diseases, 10th Revision F42.0-F42.2) were recruited from the outpatient clinic for anxiety disorders of the University of Leipzig Department of Psychiatry. The WHOQOL-BREF, a self-administered questionnaire developed by the World Health Organization, assessed QoL. These findings were compared with the QoL of a representative sample of the general German population. Results: Compared with that of the general population, the QoL of relatives of patients with OCD was significantly lower in the domains physical well-being, psychologic well-being, and social relationship. Conclusions: Obsessive-compulsive disorder has an adverse effect on the subjective QoL of relatives of patients with OCD. Therefore, these findings suggest that professionals working with relatives must focus not only on the care given to persons with an illness but also on their relatives' situation and personal QoL. (c) 2006 Elsevier Inc. All rights reserved.