Peers have been shown to be an important interpersonal influence on women's disordered eating (Crandall, 1988; Pauls & Daniels, 2000). The present study extended research on peer influences on disordered eating by examining disordered eating in female college roommates. Given previous research suggesting that peers are homophilous in attitudes and behaviors (Kandel, 1978a) and affective distress (Hogue & Steinberg, 1995), it was hypothesized that roommates would be similar on disordered eating. In addition, given the association between disordered eating and depression, depressive symptomatology was examined as it relates to homophily of disordered eating. Body comparison was assessed as a potential mechanism promoting roommates' similarity. In addition, aspects of the roommate relationship, depression, and ethnic differences were hypothesized to differentially influence homophily. One hundred twenty pairs of roommates at a large, diverse northeastern university completed measures of roommate rapport, roommate satisfaction, shared activities, disordered eating, and depression. Results supported the hypothesized relationships. Specifically, roommates were similar in levels of disordered eating. Body comparison mediated homophily of disordered eating. Certain factors moderated similarity of roommates' disordered eating; (1) Roommates who spent more time together were more similar in disordered eating; (2) Satisfied roommate pairs in which one woman was experiencing depressive symptoms were more similar on disordered eating; (3) Roommates who were more similar on depression were more similar on disordered eating; and (4) Roommates of the same ethnic background were similar in disordered eating, whereas roommates of different ethnic backgrounds were dissimilar in disordered eating. However, hypotheses were supported either for disordered eating or for bulimic symptomatology but not both. This study illustrates that women who cohabit are homophilous in disordered eating and elucidates mechanisms and contextual factors to explain that similarity. In addition, the results suggest that depression and disordered eating may be part of a larger syndrome for women, which is manifest differently depending on contextual factors.