The existentialist movement was largely responsible for the major advance in Kierkegaard's international reception that took place in the twentieth century. In Kierkegaard's writings one can find a rich array of concepts such as anxiety, despair, freedom, sin, the crowd, and sickness that all came to be standard motifs in existentialist literature. The articles feature figures from French, German, Spanish and Russian traditions of existentialism. They examine the rich and varied use of Kierkegaard by these later thinkers, and importantly, they critically analyze his purported role in this famous intellectual movement.