Introduction: Stuttering is a multidimensional disorder that encompasses temperament. Stigma and temperament are interrelated characteristics. Objective: The aim of this study is to examine the relationship between temperament traits and self-stigma levels in individuals who stutter. Method: The study included a total of 106 individuals who stutter, consisting of 87 men and 19 women between the ages of 18 and 60. Data were collected using the Adult Temperament Questionnaire and the Perceptions of Stuttering Inventory. For statistical analysis, Independent Samples t-test and Spearman correlation were used. Results: Impulsive negative affect showed a positive and significant relationship with total stigma score (r=0.277; p=0.004) and stereotype endorsement (r=0.333; p=0.0005). Sensory-sensitive negative affect was significantly associated with stigma awareness score (r=0.213; p=0.029). Sensitivity was positively correlated with both stigma awareness score (r=0.345; p=0.0003) and total stigma score (r=0.289; p=0.003). Extraversion was negatively correlated with stigma awareness score (r=-0.224; p=0.021), stereotype endorsement (r=-0.318; p=0.001 < 0.01), self-application (r=-0.473; p=0.0001), and total stigma score (r=-0.465; p=0.0001). Effortful control was negatively associated with both self-application (r=-0.323; p=0.001) and total stigma score (r=-0.279; p=0.004).Furthermore, it was found that women had significantly higher stigma awareness than men (t=3.844; p=0.0001), and individuals with a master's or doctoral degree exhibited significantly lower self-stigma levels (U=132; Z=-2.574; p=0.01). Participation in self-help groups and previous therapy experiences were not found to have a significant effect on stigma (p > 0.05). Conclusion: The findings reveal that temperament traits play an important role in the stigmatization process of individuals who stutter. Increasing awareness of stigma and strengthening protective temperament traits are important strategies to mitigate the effects of stigma. Keywords: Stuttering, temperament, adult.