The Historical Dictionary of Existentialism explains the central claims of existentialist philosophy and the contexts in which it developed into one of the most influential intellectual trends of the 20th century. This is done through a chronology, an introductory essay, a bibliography, and more than 300 cross-referenced dictionary entries offering clear, accessible accounts of the life and thought of major existentialists like Jean-Paul Sartre, Martin Heidegger, Martin Buber, Karl Jaspers, Gabriel Marcel, Simone de Beauvoir, Albert Camus, and Maurice Merleau-Ponty, as well as thinkers influential to its development such as Wilhelm Dilthey, Henri Bergson, Edmund Husserl, and Max Scheler. Historical Dictionary of Existentialism affords readers an integrated, critical, and historically-sensitive understanding of this important philosophical movement.