Anger and anger rumination are considered to be detrimental to both physical and psychological well being. Furthermore, perfectionism, as a personality construct, seems to be related to various types of maladjustment. Whereas perfectionism has been characterized as being positive when an individual derives pleasure from striving for excellence yet recognizes and accepts individual limitations, it is deemed negative when the individual has unrealistic expectations and is never satisfied with his or her performance. The present study examined whether positive and negative perfectionism was associated with anger and anger rumination. The Farsi version of the Positive and Negative Perfectionism Scale and the Farsi version of the Anger Rumination Scale, as well as Spielberger's State-Trait Anger Scale were completed by 384 Iranian students. Results showed that anger and anger rumination were, as expected, associated negatively with positive perfectionism and associated positively with negative perfectionism. Positive perfectionism enables individuals to strive for success in a flexible manner and, thus, to experience satisfaction and pleasure rather than dissatisfaction, frustration, and anger. Conversely, negative perfectionism makes individuals vulnerable to emotional distress such as predisposition to experience anger and anger rumination through setting high standards for performance, overgeneralization of perceived failures, negative self-evaluation, self-blame, and measuring self-worth in terms of unachievable goals of accomplishment and productivity. Hence, perfectionism may be regarded as having both adaptive and maladaptive aspects with regard to health.