This study aims to determine the effect of Venn Diagram Vocabulary Graphic Organizer on Vocabulary Mastery of the first-grade students of SMP Negeri 23 Pekanbaru in the 2024/2025 academic year. The research employed a one-group pretest-posttest design as part of a pre-experimental quantitative method. A sample of 40 students from class VII F was selected through cluster random sampling. Data we…