Introduction: Child labor is a persistent problem throughout the world, particularly in developing countries. It is widespread in rural areas of those countries where income deficiency is widespread. It not only damages the well-being of individual children, but also slows broader national poverty decline and development efforts. The Aim of the study: This study aimed to identify the relation between child labour and aggressive behavior among school age children. Research Design: A descriptive comparative design utilize in this study. Setting: This study was conducted at 1-Industrial workshops at Al Bayoum village.2- three factories at Al Nakhas village 3- two governmental primary schools one from each village. Subjects: The subject of this study was purposive sample composed of 180 of working and school children Study tools of data collection: First tool: A structured interview questionnaire sheet, and Second tool: Aggression scale. Results: revealed that 57.8% of working children reported that helping their family was the main cause for work and 41.1% of working children were insulted and punished by their owner of work. It was found that 81.8% of working children had a high level of aggressive behavior. Conclusion: there was a statistical significant difference between both groups of working and school children regarding level of the aggressive behavior. Recommendations: All ministries and community agencies must have strict enforcement and real application of existing laws to eliminate all forms of child labour.