Objectives: The aim of the present study was to determine social phobia and its relationship with demographic characteristics in adults with stuttering disorder. Method: The present descriptive-analytic study conducted among 30 adults 18 years and older (25 male, 5 female) with stuttering disorder with high school diploma or higher education certificates. Stuttering and its severity were examined by "Severity of Stuttering Instrument-3^rd edition". Social phobia measured by "Social Phobia Inventory". Data were analyzed via SPSS software using Spearman, Mann-Whitney and Kruskal Wallis tests. Results: Findings indicated that 26% of adults (8 of 30 people) had high level of social phobia. There was no significant relationship between social phobia and age (r=0.075, p=0.696). Also there were no significant differences in level of social phobia between women and men and subjects with different level of education (p=0.148, p=0.357). Conclusion: Social phobia is not related to demographic characteristics like age, gender or education in adult with stuttering disorder.