This book presents cutting-edge research on the production and perception of speech rhythm by speakers of English in countries where it is used as a foreign language or an institutionalised second language (also sometimes known as the Expanding and Outer Circles). It contributes to a better understanding of speech rhythm, which has long been recognised as an important supra-segmental category of speech, focusing on its relevance in World Englishes, Second Language Acquisition and learner varieties of English, as well as the sociolinguistic and perceptual significance of this phonological variable.