This literature review examines how Augmented Reality (AR) has been used in foreign language learning. AR is a live view of reality that is augmented by computer-generated sound, image, or videos. It allows the user to interact with the real physical environment in an enhanced way. This study provides an overview of what AR is, its history, different definitions, and how it has been used in education in general. It summarizes how AR has been used in all aspects of foreign language education, including skill development (listening, speaking, reading and writing), vocabulary, grammar, culture, the aspect of affect in language learning, what AR tools were used, and a discussion of the advantages and disadvantages of AR in language learning. At the end of the article, the author suggests further research needed to support the widespread adoption of AR in foreign language education in general and in Chinese-as-a-Foreign-Language, specifically.