The essays collected in this volume demonstrate that during the age of revolution (1760s–1840s) most sectors of the maritime industries experienced higher levels of unrest than is usually recognized. Ranging across global contexts including the Atlantic, Indian, and Pacific Oceans as well as the Caribbean, Andaman, and South China Seas, and exploring the actions of sailors, laborers, convicts, and slaves, this collection offers a fresh, sea-centered way of seeing the confluence between space, agency, and political economy during this crucial period. In this introduction we contend that the radicalism of the age of revolution can best be viewed as a geographically connected process, and that the maritime world was central to its multiple eruptions and global character. Mutiny therefore can be seen as part of something bigger and broader: what we have chosen to call maritime radicalism, a term as well as a concept that has had virtually no presence in the literature on the revolutionary era until now.