In psychiatry, histrionic personality disorder (HPD), or hysterical personality disorder, is a personality disorder which involves a pattern of excessive emotional expression and attention-seeking, including an excessive need for approval and inappropriate seductiveness, that usually begins in early adulthood.

The essential feature of the histrionic personality disorder is a pervasive and excessive pattern of emotionality and attention-seeking behavior. These individuals are lively, dramatic, enthusiastic, and flirtatious. They may be inappropriately sexually provocative, express strong emotions with an impressionistic style, and be easily influenced by others.

The cause of this disorder is unknown, but childhood events and genetics may both be involved. It occurs more frequently in women than in men, although some feel it is simply more often diagnosed in women because attention-seeking and sexual forwardness is less socially acceptable for women. The Histrionic Personality Disorder is only rarely found in men. However, in these instances there may be additional difficulties with regard to this person's sexual identification.