We describe an adolescent boy's experience of peer victimization and its relation with his development of obsessive–compulsive disorder (OCD). Subsequent to being peer victimized, this boy was seen for 20 sessions of cognitive–behavioral therapy over the course of 4 weeks that followed the protocol outlined by March and Mulle in 1998. Standardized post-treatment assessment indicated significant reductions in OCD, depressive, and anxious symptomatology as compared to baseline. This case illustrates how negative peer experiences may be related to the development and maintenance of OCD. Depression and Anxiety 00:000–000, 2005. © 2005 Wiley-Liss, Inc.