<p>The advancement of materials chemistry has provided a foundation for synthesizing a wide variety of materials, while nanotechnology has driven the development of scientific and technological methods for investigating fine structures down to the atomic and molecular levels. The next stage requires research approaches that combine these characteristics, namely, the creation of functional materials that capitalize on the properties of nanostructures. The concept envisioned to fulfill this role is nanoarchitectonics, which can be considered a post-nanotechnology concept. This review aims to explore the features of nanoarchitectonics by dividing it according to size domains. The studies at atomic, molecular, and nanoscales clearly reflect how nanotechnology can be utilized in materials chemistry. Nanoarchitectonics at the macroscopic level is deeply involved with materials science and holds significant promise for applications. At the micro- and mesoscopic levels, processes that bridge nanoscale phenomena with macroscopic fabrication are required. The primary role in these processes is played by self-assembly, whereby molecules or objects spontaneously organize. As illustrated by many research examples, it is common for multiple processes, such as polymerization reactions in addition to self-assembly, to be involved. This characteristic—integrating multiple processes to construct functional structures—is a hallmark of nanoarchitectonics. From these examples, it is clear that nanoarchitectonics serves as a concept that bridges a wide range of size regimes, from atoms and molecules to materials of macroscopic dimensions. Nanoarchitectonics is a fusion of nanotechnology and materials science, where, along the continuum from smaller to larger scales, it transitions from nanotechnology to materials science. In the intermediate regions, spontaneous processes such as self-assembly play a crucial role.</p> Graphical Abstract <p></p>