Obsessive-compulsive personality disorder (OCPD), also known as anankastic personality disorder, is a diagnosis in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), for individuals with a pattern of [Page 2363]long-standing and maladaptive perfectionism, rigidity, and preoccupation with control that negatively affects most domains of functioning. OCPD is common in the general population, but due to its frequent overlap and co-occurrence with other disorders, especially with obsessive-compulsive disorder (OCD), it may be unrecognized or confused with OCD or other disorders. Some findings suggest that classification of OCPD among personality disorders may not be appropriate. Little is known about its causes. Various psychological treatments have been used for OCPD, but there is little evidence of their effectiveness.