The Pursuit of the Millennium: Revolutionary Millenarians and Mystical Anarchists of the Middle Ages (1957, revised and expanded in 1970), is Norman Cohn's study of millenarian cult movements.

Covering a wide span of time, Cohn's book discusses topics such as anti-Semitism and the Crusades, in addition to such sects as the Brethren of the Free Spirit, flagellants, the Anabaptists, and the Ranters. The Pursuit of the Millennium concludes with a discussion of the theocratic king John of Leiden, who took over the city of Münster in 1534.

Legacy

The book was often quoted, in particular by Guy Debord of the Situationist International.

In William Gibsons novel Spook Country the character Milgrim is reading this book and takes it with him wherever he goes. Author and title are never mentioned.

British political philosopher John N. Gray has cited the work as a 'life-changing' influence on his own research. The citation of John of Leiden evidently features prominently in Gray's own book, Black Mass.