Informant reports can provide important information regarding the presence of pathological personality traits, and they can serve as useful supplements to self-report instruments. Ratings from a spouse may be a particularly valuable source of personality assessment because spouses are very well acquainted with the target person, have typically known the person for a long time, and witness behaviors across a variety of situations. In the current study, self- and spouse report measures based on the "Diagnostic and Statistical Manual of Mental Disorders"-Fourth Edition ("DSM-IV") personality disorder criteria were collected from a nonclinical sample of 82 couples (N = 164). Agreement between self- and spouse report for several pathological personality factors was significant and somewhat higher than has been found for self and peer agreement. Nevertheless, the magnitude of self-spouse agreement was still moderate in size (mean r = 0.36). Findings are discussed with regard to using spouse report in the assessment of personality pathology. (Contains 2 tables and 5 notes.)