This book is a manifesto promoting language diversity as a human advantage and human right. As such, it is addressed to policymakers, especially in the field of education, but also more broadly with respect to multilingualism in our societies. Diversity of languages needs to be supported as a rich source of creativity in the arts, and recognized for its vital importance in the sciences. Creative Multilingualism is an experiment in interdisciplinary research in which each project demonstrates the role of languages at the creative heart of human endeavour. By placing the focus on the connection between language diversity and creativity, we seek to demonstrate that beyond their communicative usefulness, languages also sustain and enrich thought, literacy, social cohesion, the creative arts and scientific engagement with sustainability.