Today, authenticity is considered an essential part of manifold interpersonal relationships, actions, and agreements. Authenticity's association with sincerity, honesty, and reliability not only normatively charges the term in the context of social coexistence, but also makes it a demand which we impose on ourselves: The success of our lives is measured decisively by whether we live in harmony with our own convictions, wishes and needs. In philosophy, authenticity has also become the focus of interest, both in the context of the mechanisms of self-knowledge, as well as of personal development. The anthology aims to expand the cooperation across disciplines, in order to develop a comprehensive and profound understanding of authenticity, not by over-simplifying the highly complex subject, but by approaching the underlying concept from different scientific perspectives.