Background & Objectives: Epilepsy is relatively common neurological disease of childhood that affects approximately 5-10 per 1000 children. This disorder affects ability and performance of children and influences their mental health. This study aimed to determine the social competence and behavioral problems of healthy school-age children and children with epilepsy. Methods: In this descriptive–analytical study, 150 children in the age of 6-12 years including 50 with epilepsy and 100 healthy ones were selected from Ghaem Hospital and 11 schools located in Region 6 of Mashhad city. Parents completed “Strength and difficulties”, “Child behavior”, and “demographic characteristics” Questionnaires within 20 minutes. Validity of questionnaires was determined through content and face validity methods and reliability was assessed by internal consistency. Data were analyzed by Mann-Whitney, variance analysis, and multiple regression tests. Results: Statistically significant difference was observed between social competence of epileptic and healthy boys (p=0.02). Problems in relation with peers (p=0.01) and emotional problem (p=0.03) in children with epilepsy significantly differed from those of healthy children. Conclusion: Epilepsy disorder reduces social ability of school-age children and they have more difficulties regarding to behavioral, emotional, and communication with peers than their healthy peers.