Bullying dangers the development of children. Educational efforts to prevent and minimize bullying are significant. This research aims to describe the process of implementing the Stop Bullying application and show a reduction in bullying at SDN Karangwaru 2. This research was a qualitative type with an ethnographic approach. The research was conducted at SDN Karangwaru in the village of Karangwaru, Plupuh, Sragen, Central Java, in the 2022/2023 school year. The subjects of this study were fifth-grade elementary school students, the fifth-grade teacher, and the principal. Data was collected through interviews, observation, documentation, and scoring rubrics. The validity of the data was tested by triangulation of sources and techniques. The data analysis technique was inductive, starting with specific facts and producing generalizations in general statements. This study's results are: 1) Using the Stop Bullying application is carried out through the preliminary, core, and closing stages. 2) There is a decrease in students' bullying tendencies based on observations using a rubric with indicators of bullying after using the application. The average score of students' bullying tendencies before and after the application is 2.615 decreasing to 2.333. After using the Stop Bullying application, students care more about their friends and remind them when bullying occurs at school.