Metal-diamond composites have been identified as promising materials for applications in which high thermal conductivity and low coefficient of thermal expansion is required, e.g. applications of thermal management. Besides the intrinsic properties of the metal matrix and the diamond the load and heat transfer at their interface is key for the composite performance. The present talk gives an overview of the current state of the art of metal diamond composites for thermal management with focus on ways of improving interface heat and load transfer across the diamond metal interface.