This study investigates the effectiveness of experiential learning strategies in enhancing science subject competence among fifth-grade elementary students in Anbar Governorate, where traditional teaching methods dominate. Prior research indicates a lack of engagement and critical thinking among students, emphasizing the need for pedagogical approaches that promote active learning and real-world experiences. Employing a descriptive and experimental design, this research included two groups: an experimental group receiving instruction through experiential learning and a control group taught via traditional methods. The sample consisted of 65 fifth-grade students from Al-Mu'min Primary School, chosen to ensure representativeness. Pre-experimental assessments ensured equivalence in variables such as age, intelligence, and previous academic achievement. The study's impact was evaluated using a post-test composed of 40 multiple-choice questions aligned with the science curriculum. Statistical analysis revealed a significant difference in mean achievement test scores between the groups, with the experimental group achieving a higher average score of 29.90 compared to the control group's 22.55. The calculated t-value was 10.11, surpassing the critical t-value of 2.00 at the 0.05 significance level, indicating strong evidence for the effectiveness of experiential learning strategies. Furthermore, the effect size measured using eta squared (η² = 0.63) confirmed a large impact on student achievement. The findings signify that experiential learning strategies substantially enhance science subject competence among elementary students, fostering greater engagement and understanding of scientific concepts. These results advocate for the integration of experiential learning methodologies in science education, reflecting a shift away from traditional teaching practices to more effective, student-centered approaches that promote critical thinking and real-world application of knowledge.