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The research investigated the effectiveness of using a Semantic Web-based program in developing pre-service English Language teachers' teaching competencies. The research's instruments included a teaching competencies checklist and a competencies test and the Semantic Webbased program. Thirty-four major students at Hurghada Faculty of Education participated in the research as pre-service English language teachers. The participants studied the Semantic Web-Based program during the second semester of the academic year 2022/2023 at Hurghada Faculty of Education. They were post-tested to identify the effectiveness of the proposed program. The findings showed statistically significant differences between participants' mean scores in the pre-post testing favoring the posttesting in lesson planning, implementation and assessment. The results indicated that the Semantic Web was effective for pre-service English Language teachers because it provided interactive, diverse resources that enhanced engagement and facilitated personalized learning experiences. This approach significantly improved their competencies in lesson planning, implementation, and assessment by integrating theory with practical application. Recommendations suggested that customizing programs for varied educational contexts and investing in technological infrastructure were advised to enhance the effectiveness of Semantic Web tools in teaching.