Laminated metal composites are a typical representative of composites having microstructural architectures. These materials not only make full use of the intrinsic properties of the individual constituent phases, but also take advantage of the synergistic, coupling, reinforcing effects, and the multifunctional response mechanisms of the different phases. Metallic laminates with repeat layer thickness on the micro/nanoscale possess abundant interphase interfaces and are characterized by special sizedependent mechanical behaviors, so that balanced strength and toughness can be achieved by taking advantage of the excellent mechanical properties of the micro/nanoscale constituents, and by tailoring the crack initiation and propagation mechanism. Therefore, metallic micro and nanolaminates are widely used in aerospace, petroleum, machinery, and electronics industry. In this paper, the fracture properties of metallic micro/nanolaminates are reviewed, with particular focus on the microscopic mechanisms and influencing factors of fracture toughness. The fabrication processing and engineering application of these materials are also discussed, and critical microstructural parameters that affect their fracture toughness are identified. It is proposed that by using stateofart, micro/nanoscale characterization tools (such as in situ SEM/TEM and threedimensional atomic probe) combined with sitespecific microstructural analysis may provide important implications on the fracture mechanism of micro/nanolaminated metallic materials, leading to improved modeling and design of these materials.