This article discusses the development of relations between Protestantism and the Trade Union Movement in Germany during the 20th century. At present, despite some differences concerning the rights of staff of the Diaconia in Germany, there are many similarities between the two organisations, Protestantism and trade unions, in their perception of social problems and in their proposals for coping with these challenges. The article shows, how, step by step, both are en route to joint socio-political cooperation