Extracurricular activities (ECAs) are an integral part of adolescent development and have been linked to positive outcomes such as increased self-concept, academic performance, and social well-being. Although much research has been conducted in this area, few studies have explored the nuances of different types of ECAs, and even fewer have explored these effects in a Canadian population. Furthermore, very little is known about how immigrants are impacted by these activities and what benefits they may gain from them. To address this gap in the literature, this study uses data from Statistics Canada's Canadian Health Survey on Children and Youth (2019) to analyze the impact that different extracurricular activities have on self-concept among adolescents (12 - 17 years) in Canada and how these effects differ between immigrant and non-immigrant populations. Our results demonstrate a positive relationship between participation in ECAs and self-concept, while also revealing disparities in ECA participation between immigrant and non-immigrant youth. Despite some limitations, such as the lack of a concrete self-concept measure within the CHSCY dataset and small effect sizes, this research provides valuable insights into the impact of ECAs on adolescent self-concept in the general Canadian population and has implications for educators, community organizers, and policymakers in devising strategies to promote inclusive and accessible extracurricular opportunities for all young Canadians.