The aim of this study was to determine the effectiveness of the Science teaching process to middle school students using teaching materials prepared via augmented reality (AR) technology. In the experimental study, 61 sixth grade students at a middle school in Antalya in the 2019-2020 academic year were selected randomly, and the mixed research design was utilized to understand the academic achievements of students and their' opinion about the augmented reality implementations in Science classes. In the study, the control group were taught through the science curriculum prescribed methods, and the experimental group were taught using augmented reality implementations, and these groups were compared in terms of their achievement. The quantitative data were collected via an achievement test, and the qualitative data were collected via an interview form. The quantitative and qualitative data were analyzed using t-test and descriptive data analyses methods. As a result of the study, it was revealed that AR implementations contributed positively to students' science learning processes, and it increased their academic achievement. It was also shown that AR implementation contributed to students' meaningful learning by making abstract subjects concretized, and at the same time it increased students' interest and motivation in Science lessons.