Constituent power is usually attributed to a unified people, whereas federal systems are often predicated on the existence of a plurality of constituent peoples. With some limited exceptions, there has been little examination of how a pluralised locus of constituent power might function in federal and multilevel systems. This gap in the literature is significant because there are many prominent federal and multilevel democracies in which the nature and locus of constituent power has had important legal ramifications, such as Australia, Canada, Germany, India, Malaysia and the United States, as well as, in a different way, the European Union. This paper will examine the possibility of a pluralised concept of constituent power and explore its ramifications for constitutional law. It will approach the question both theoretically and empirically, closing with some remarks about comparative methodology and case selection in the study of plural constituent power.