This volume is the first book-length presentation of the grammatical category of Associated Motion. It provides a framework for understanding a grammatical phenomenon which, though present in many languages, has gone unrecognized until recently. Previously known primarily from languages of Australia and South America, grammatical AM marking has now been identified in languages from most parts of the world (except Europe) and is becoming an important topic in linguistic typology. The chapters provide a thorough introduction to the subject, discussion of the relation between AM and related grammatical concepts, detailed descriptions of AM in a wide range of the world's languages, and surveys of AM in particular language families and areas.