The purpose of MetFoam conference series is to provide a state-of-the-art review on lightweight porous metals and metallic foams and a forum for discussions and networking opportunities for scientists working in this field. Topics included in this volume include the following:• Fabrication by conventional and novel methods including additive manufacturing • Characterization • Properties of compressed and uncompressed foam • Design of porous metals, metallic foams, and lattice structures• Fluid, heat, and mass transfer • Porous biomaterials• Nanoporous metals• Industrial applications of porous metals and metallic foams