This encyclopaedia entry explores the intersection of Mobile-Assisted Language Learning (MALL) and metacognition, highlighting how mobile technologies foster language acquisition by promoting self-regulated learning, providing immediate feedback, and supporting personalized and context-aware learning. The synergy between MALL and metacognition enhances learners’ ability to plan, monitor, and evaluate their learning strategies. The entry discusses how MALL facilitates the development of metacognitive skills through flexible, collaborative, and reflective learning opportunities. This integration has significant implications for language teaching methodologies, curriculum design, and the advancement of educational technologies, making MALL a powerful tool for improving language proficiency and cognitive development.