Augmented Reality (AR) is increasingly being explored in language education for its potential to augment learner engagement, reduce cognitive load, and improve language proficiency. This study investigates the cognitive and pedagogical impacts of AR-based instruction in an intermediate-level English language learning context. It was a quasi-experimental pre-test-post-test study, where 60 students were provided with two matched groups, a group with instruction aided by AR and another that used traditional classroom approaches. Over four weeks, the experimental group engaged with mobile AR applications integrated into communicative language tasks. Cognitive load was assessed using the NASATLX, learner motivation through the Language Learning Motivation Scale, and language proficiency via CEFR-aligned tests. Results showed that AR instruction significantly reduced cognitive load across mental and temporal demands, effort, and frustration. The study resulted in marked enhancements in internal and external motivational drives, the perceived significance and usefulness of the task, as well as individuals’ confidence in their ability to perform effectively. Language proficiency improved significantly across listening, reading, speaking, and writing, with the most pronounced gains in speaking skills. Qualitative feedback from instructors affirmed AR’s pedagogical feasibility and its role in enhancing learner engagement, though technological challenges were noted. These findings highlight the cognitive efficiency and motivational benefits of AR in language education and underscore its potential for scalable, immersive instructional design. © 2026 Aby John.