The purpose of this study was to look into the impact of poetry therapy program on personal and social performance as well as self-esteem in patients with mental illnesses (schizophrenia and bipolar syndrome). The research is an experimental study that employs pretest and posttest models. It was conducted with follow-up patients at the Community Mental Health Center (CMHC), between 8 February 2022 and 4 April 2022. The data were collected with Personal Information Form, Personal and Social Performance Scale (PSP), and Rosenberg Self-esteem Scale. There is a significant difference in the patients’ self-esteem scores after therapy based on their group (t (25) = –2.396; p = .024 < .05). The control group's posttherapy self-esteem scores (x̄ = 3.333) were found to be higher than the treatment group's posttherapy self-esteem scores (x̄ = 1.917). There was a significant increase in posttherapy personal and social performance level (x̄ = 66.319) compared to pretherapy personal and social performance level (x̄ = 61.806) (t = –3.223; p = .008 < .05).