||Recently, there has been interest in revising the diagnostic system for personality disorders to a dimensional model rather than the current dichotomous model. A person could therefore be placed anywhere along a continuum of personality disorder severity, from none at all to very severe. Personality disorders may thus be abnormally extreme variations of certain personality traits. Because many personality disorders involve abnormal interpersonal behavior, they should manifest as distinct behavior patterns during interpersonal interaction. The current study of college students examined relations between observed interpersonal behavior and dimensional scores on Avoidant Personality Disorder and Obsessive-Compulsive Personality Disorder. Avoidant Personality Disorder scores correlated positively with scores on volunteering personal information and regarding the self as physically attractive, and negatively with scores on expressing agreement, expressing sympathy, exhibiting intelligence, seeking reassurance, and expressing guilt. Contrary to predictions, Obsessive-Compulsive Personality Disorder scores correlated positively with scores on talkativeness and speaking loudly, and negatively with scores on reserved behavior, maintaining distance, and appearing detached. Possible explanations for the unexpected findings are discussed, and implications for future research are proposed. These types of investigations will be critical in understanding personality and treating personality disorders, from the perspective of interpersonal behavior.