The focus of this course is to discuss how language reflects and affects well-being. This course will examine the relationship between language and well-being from three aspects, namely multilingualism, linguistic diversity and psycholinguistics. It will offer students the opportunity to explore language interdisciplinarily through linguistics, sociology, biology, and psychology, and nurture novel ways of understanding human languages. This course emphasises using language data across the world for the analysis of the relationship and empirical applications between language and well-being, covering not only dominant languages such as English and Chinese, but also the lesser-known ones spoken in places such as Southwest China, Amazonia and New Guinea.