Aims: Nowadays, the prevalence of Low Back Pain (LBP) is a growing problem. The prevalence of LBP in Iran is almost as high as in other countries of the world. There are no accurate data on prevalence of LBP in Iran. Thus, the aim of this research was to estimate the prevalence of LBP and risk factors in Iran during a systematic way. Method and Instruments: Totally, 17 studies of internal databases including Iran Doc, Magiran, SID, Iran Medex, Medlib and external databases including Scopus, Pubmed, Science Direct, Web of Science, Embase, Cochrane, Medline through using keywords like "Iran", "LBP", "children," Adolescents, "Associated Factors", "Prevalence" were obtained. Findings: The prevalence and risk factors of LBP in children and adolescents were obtained from 15 articles with a sample size of 24,175. The lowest and highest prevalence of LBP in children and adolescents were 50% and 7.4%, respectively. Conclusion: Given the high prevalence of LBP in children and adolescents and the numerous demographic, personal, physical, familial and psychological risk factors, the LBP prevent planning for this age group to prevent and promote health is strongly recommended. LBP has a special place in the community's health education, owing to its' prevalence andits impact on health of people during youth and adulthood period. .