This handbook represents the first structured, academic overview of constructed languages, including not only well-known examples like Esperanto and Klingon, but also those created for educational, philosophical, and communication purposes. Divided into parts covering engineered languages, auxiliary languages, artistic languages, constructed languages in education, and constructed languages in psycholinguistic and sociolinguistic research, the volume brings together experts and leading scholars from a wide array of fields to provide an in-depth overview of this dynamic and growing field. Constructed languages are becoming increasingly popular, and the development of the internet has allowed people across the world to share their ideas and meet in like-minded online forums. This handbook will therefore be of interest not only to Linguists, Educationalists, and Film, Media, and Literature specialists, but also constructed language creators and enthusiasts.