This volume of Diffusion Foundations is entitled Advances in Mass and Thermal Transport in Engineering Materials. The volume was designed to capture a very wide cross-section of research in the area in both experimental and modelling of mass and thermal transport and at both basic and applied levels. It is now very well recognized that the mass and thermal transport processes in engineering materials underpin much of the advance in the development of new materials and the improvement of existing materials. Whether it be the ongoing enhancement of the engineering properties of materials, the materials processing, the in-service longevity of materials or the recycling of materials, mass and thermal transport very frequently play direct and essential roles.