Societies and churches are increasingly faced with pluralism and inequality. This development is noticeable at both national and international levels. It is also a challenge for diaconal work. In September 2016, the 6th International Conference for Research in Diaconia and Christian Social Practice was held in Helsinki. It sought to re-evaluate both the practices of diaconal work and the underlying perceptions behind them. The theme of the conference was Diaconia in Dialogue - The Challenges of Diversifying Contexts. It is also the name of this publication. This book contains ten articles based on conference presentations. They use the multidisciplinary method to approach the topic from the perspective of churches, religions and societies. The book consists of three parts, divided into themes related to the theory and theology of diaconia, the renewing working practices and professionalism of diaconia, and the values and attitudes of the world globally. The publication is a polyphonic speech about diaconia and social justice in today's society. It is aimed at diaconia workers, students, and anyone interested in the basics and renewing practices of diaconia.