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Socially anxious people report less closeness to others, but very little research has examined how social anxiety is related to closeness in real-time social interactions. The present study investigated social anxiety, closeness, and cortisol reactivity in zero-acquaintance interactions between 84 same-sex dyads (168 participants). Dyads engaged in either a high or low self-disclosure discussion task and completed self-report measures of closeness and desired closeness post-task. Salivary cortisol was collected before, during, and after the self-disclosure task. Multilevel models indicated that in the high self-disclosure condition, individuals higher in social anxiety displayed flatter declines in cortisol than those lower in social anxiety; cortisol declines were not significantly related to social anxiety in the low self-disclosure condition. Further, across both conditions, individual’s social anxiety was associated with …