Differences in defensive functioning between those who reported a history of childhood sexual abuse (CSA) and those who did not was examined in a naturalistic treatment-seeking sample of adult outpatients (N = 67). Defensive functioning and childhood sexual abuse history were rated by clinicians and external raters utilizing the DSM-IV Defensive Functioning Scale and the Abuse Dimensions Inventory, respectively, based on information gathered as part of a larger therapeutic assessment. Individuals reporting a history of CSA were found to use more major image-distorting level defenses than the non-CSA group, and abuse severity was also related to greater use of major image-distorting level defenses. Those reporting a history of CSA relied more on defenses indicative of impairment in realistic perception of self and others. This defensive style likely contributes to the greater difficulties in interpersonal functioning and psychological problems in adulthood.