This research has as its theme the proclamation of Jesus about the Kingdom of God in the theology of Joseph Ratzinger and in the Magisterium of Benedict XVI. It is part of the research activities of the Postgraduate Program in Theology of PUC-Rio, Area of Concentration Systematic-Pastoral Theology, research line Faith and Culture, research project Joseph Ratzinger s Theology and the Magisterium of Benedict XVI. Intending - as its main objective - to investigate, through the interpretation of the texts of this author, the meaning that the approached reality assumes in his theological thinking and in his teaching and to identify its importance in understanding the figure and message of Jesus. In this last element, we seek to emphasize the aspect of the great and important question that deals with the relationship between the proclamation of the Kingdom of God by Jesus of Nazareth and the origins of Christology. In order to gain a better understanding of how Joseph Ratzinger-Benedict XVI interprets the kingdom of God and how its interpretation is grounded and applied. It is also part of the scope of the research to identify elements that distinguish their interpretation compared to other authors and also if their interpretation suffers any change in the evolution of their work. As is well known, in the context of the discussion of the historical Jesus, this issue is an essential aspect, many authors have addressed it, and many interpretations have been offered to it at least since the 18th century, with the advent of historical and critical research.