This study aims to help improve the learning outcomes of third-grade elementary school students in the Indonesian Language subject using pop-up books as a learning medium. Indonesian Language is a required subject for all students; however, the learning outcomes of some students have not yet met the KKTP standards. The action research (PTK) method was used in this study across two cycles. In each cycle, the PTK action research consisted of four stages: planning, acting, observing, and reflecting. Data were collected using observation sheets, questionnaires, and test sheets. In the pre-intervention phase, the students’ overall achievement rate was 67.8%, with a target of 75% out of 28 students. After implementing the intervention in Cycle I, there was an increase in the overall achievement rate to 71.4%, which then rose further after Cycle II to 96.4%. The conclusion of this study is that the implementation of pop-up books as a learning medium for third-grade students in the Indonesian Language subject can help improve student learning outcomes in composing short dialogues between two people.
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