This collection brings together an international range of specialists to explore the multi-faceted ways in which twentieth-century French philosophy affirms the fundamental importance of transformation. The essays enhance our understanding of how various individual French philosophers have conceived the term, including the innovative implications of their respective conceptions. They show that although emphasis is often placed on its heterogeneity and the differences between its proponents, twentieth-century French philosophy is fundamentally, if implicitly, shaped around a common focus on the primordial importance of transformation. By engaging with the thinking of Bergson, Sartre, Beauvoir, Merleau-Ponty, Fanon, Deleuze, Foucault, Derrida, Kristeva, Ricœur, Ruyer, Simondon, Serres, Castoriadis and Malabou, the contributors also rethink a range of issues, including ethics, information, ontology and politics.