The minimal use of learning resources and the underutilization of technology in learning materials used in science education have an impact on students' learning outcomes. This study aims to develop and test the feasibility, practicality, and effectiveness of augmented reality-assisted teaching materials in the science subject, specifically on the topic of the solar system. This research falls under the category of Research and Development (R&D) following the Brog and Gall model. The population in this study consisted of 46 students, with a small-scale trial group comprising 12 sixth-grade students and a large-scale trial group comprising 34 fifth-grade students from SD Negeri 3 Bebengan. Data collection techniques included test techniques such as pretest-posttest and non-test techniques such as observation, interviews, questionnaires, and document analysis. The validation results of augmented reality-assisted teaching materials by media, content, and language experts indicated that the materials met the validity criteria. Based on the pretest-posttest results, it was found that augmented reality-assisted teaching materials were effective in improving students' learning outcomes, as evidenced by the increase in the average pretest-posttest score by 39.53, from an average pretest score of 40.68 to 80.21 in the posttest, with an N-gain score of 0.7 indicating moderate effectiveness. The response from teachers and students through distributed questionnaires was very positive. From these results, it can be concluded that augmented reality-assisted teaching materials are effective in improving science learning outcomes and are suitable and practical for use in science education in elementary school grade five