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Objective: The aim of this study was investigate to type D personality traits of in schizophrenia patients and the relationship between personality and clinical parameters. Methods: The study included 100 patients with schizo-phrenia who were aged between 18-65, inpatient or outpatient follow-up, and 92 healthy controls matched for sociodemographic data. To all participants; Sociodemographic data form, Type D personality scale (DS-14), Schizo-phrenia Positive and Negative Syndrome Scale (PANSS), Calgary Depression Scale for Schizophrenia (CDSS) were applied. Results: The comparison of the groups showed a significant difference in DS-14, negative affectivity and social inhibition. In the results of Pearsons correlation analysis of schizophrenia patients; the DS-14 negative affectivity subscale and PANSS positive symptom subscale, general functioning level and CDSS scores were inversely related. While DS-14 social inhibition and PANSS all subscales were negatively correlated. Discussion: The results of our study; it was found that patients with schizophrenia had higher D-type characteristics and those with D-type personality had poorer functionality. It was found that type D personality traits were higher rates in patients with additional medical illnesses, psychiatric disorders requiring family treatment, smokers and those with old psychiatric hospitalizations. In order to improve the functionality of patients with schizophrenia, it may be beneficial to evaluate personality traits in addition to pharmacotherapy. [Anadolu Psikiyatri Derg 2020; 21(3.000): 229-236]