The Personality Beliefs Questionnaire (PBQ) is a 126-item self-report measure of beliefs associated with personality disorders. Beck and Beck (1991) developed the Personality Belief Questionnaire (PBQ) to measure the beliefs associated with ten DSM personality disorders. The PBQ is a 126-item self report measure of beliefs purported by cognitive theory to be relevant to the following DSM-IV personality disorders: Avoidant, dependent, obsessive-compulsive, histrionic, passive–aggressive, narcissistic, paranoid, schizoid, antisocial and borderline. The items of the PBQ were based on the clinical observation of Beck et al (1990). The PBQ is a promising instrument for identifying beliefs pertinent to a range of personality disorders.