DKRZ, the German Climate Computing Centre, is a national service provider which constitutes an outstanding research infrastructure for model-based simulations of global and regional climate and the investigation of the processes in the climate system. DKRZ’s principal objectives are provision of adequate computer performance, data management, and service and support to use these tools efficiently. DKRZ operates one of the largest supercomputers in Germany and provides its more than 1000 scientific users with the technical infrastructure needed for the processing and analysis of huge amounts of data from climate simulations. This also includes training and support for related application software and data processing issues. DKRZ participates in many national and international projects aiming to improve the infrastructure for climate modeling. Through its research group on scientific computing DKRZ is linked to the Department of Informatics of the University of Hamburg.