<![CDATA[Mastery of vocabulary is an important and strategic foundation for the study of English because it becomes support in the development of speaking, listening, reading and writing skills. Unfortunately, in young learners, vocabulary mastery is still limited, this is because students still encounter learning media that is not engaging, based on textbooks, so that learning interest and student involvement is low. In the era of development of social media, the existence of Instagram with features short form video (Reels) provide learning media, especially in form visual and audio visual that have the potential to improve the attention, interest, and vocabulary retention students. The purpose of this research is to increase vocabulary mastery students on the fifth grade of elementary school using short form video on Instagram in learning English. This research uses Classroom Action Research (CAR) with Kemmis and McTaggart models with stages consisting of planning, implementation action, observation, and reflection. The subjects of this study were 15 students in grade five of SD Negeri 1 Wates, Campurdarat, Tulungagung. Data obtained from tests, observation sheets, and field notes are analyzed using qualitative and quantitative methods. From the results, the implementation of short form video on Instagram can increase vocabulary mastery students. Average score student pretest 48.8 and increases in the post test to 78.1 above the Minimum Completion Criteria (KKM) determined. In addition, observations have shown an increase in students' participation in learning activities, such as watching videos enthusiastically, pronouncing words, and using words in context very simple.]]>
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