Despite an overall prevalence of about 4% and a possible association with well-studied conditions such as schizotypy, little is known about effective treatments for Cluster A personality disorders (PDs), that is, paranoid, schizoid, and schizotypal PD. The aim of this systematic review and meta-analysis was to conduct a narrative synthesis of existing randomized controlled trials and explore the effectiveness of psychosocial and pharmacological treatments for these disorders. Nineteen studies including 468 participants diagnosed with any one of the three Cluster A PDs were included in the systematic review. Data from 291 (