Objective: The aim of the work is to study the prevalence, severity, demographic variables of social anxiety disorder in a convenience sample of Egyptian university students, and its impact on their academic achievement.Method: 300 undergraduate University students were assessed to detect social anxiety and quantify its severity using the standardized measure of Present State Examination, Symptom checklist prepared from DSM-IV-TR diagnostic criteria for anxiety disorders, Liebowitz Social Anxiety Scale (LSAS) and Raulin & Wee Social Fear Scale (R&W)Results: 9.3% of students were diagnosed as having social anxiety disorder, most of them were females, 7.3% of them showed moderate degree of social anxiety, and only 2% of them showed severe social anxiety. None of the students was previously diagnosed as having social anxiety disorder nor received any form of psychiatric consultation, or psychotropic medications. 4.7% of students showed subclinical social anxiety. The most commonly feared/avoided situations in students diagnosed as having social anxiety disorder were ‘Trying to make someone's acquaintance for the purpose of romantic relationship’(82%) followed by ‘Giving a talk in front of an audience’(71%)