In light of the crisis of representative democracy, radical democratic theories are gaining increasing significance. This handbook offers, for the first time, a comprehensive overview of approaches that understand democracy as a particularly intense form of popular sovereignty, featuring more than 80 contributions from distinguished experts. In addition to articles on central concepts and contributions on historical precursors and important controversies, it also includes portraits of influential representatives of radical democratic theory, including Miguel Abensour, Etienne Balibar, Wendy Brown, Judith Butler, Ernesto Laclau, Jacques Rancière, and Iris Marion Young.