Augmented reality has recently emerged as a powerful tool replacing traditional education by offering interactive learning experiences enabling learners to actively participate in their education. This approach promotes comprehension and facilitates the acquisition of knowledge. While there is an increasing amount of literature discussing the utilization of Augmented Reality (AR) in the realm of language learning, limited research exists on its efficacy among secondary school students. This study aims to investigate the impact of Augmented Reality (AR)-supported learning activities on the achievement and motivation of students towards English learning in the scope of the ninth-grade English course book, “English For Me”, in the Sultanate of Oman. For this purpose, the study used a quasi-experimental design. It consisted of 65 students from one of the Batinah South public schools in AlMusanaa, distributed to two groups, an experimental group (n=33) and a control group (n=32). To investigate the effect of AR, an activity booklet with course book materials along with supplementary activities designed based on AR was created by the researcher. During the five-week research, students in the experimental group completed the same tasks as those in the control group using an Augmented Reality (AR)-supported learning environment, as opposed to the control group's use of a coursebook and paper-based activities. An achievement test and a motivational scale based on the ARCS model were administered as the research's main data collection tools. As for the analysis of the study, an independent t-test was mainly used to depict any differences with both instruments. The study’s findings revealed a significant difference between students taught in the AR supported environment and students who relied on traditional textbook-based classroom learning for the benefit of the experimental group. The results showed that their levels of motivation were also positively affected and exceeded those of the control group. In the light of these results, the study suggested more topics to be investigated in this field and on different aspects.