Purpose: Sport specialization can cause physical injuries in athletes, but the impact of sport specialization in child and adolescent athletes aged 8 to 18 in Iran is unknown. This study aims to examine the presence of sport specialization and its associations with sex, sport type, and history of sport-related injuries.
Method: Participants completed two questionnaires. The first questionnaire consisted of the sports specialization level and participants’ demographic data, including age, sex, sport type, and physical activity participation (hours of sport participation, rest days). The second questionnaire focused on participants’ sport-related injury history. 
Result: The study confirmed the presence of youth sport specialization among athletes in this age group in Iran. No association was found between injury history and participants' sex, sport type, or sport specialization.
Conclusion: While we found the presence of sport specialization in Iran, there was no significant association between participants' sport specialization, sex, sport type, and history of sport-related injuries. However, athletes that trained more than 8 months annually in a primary sport had a positive association with prior injuries. There was a significant difference in training intensity, particularly when exceeding 8 months per year, between those with and without a history of injury. This difference underscores the impact of extended training on injury susceptibility.