Recently, understanding topological phenomena, originating from condensed-matter physics, in classical wave systems is attracting increasing interest from the research community. The advancements of arbitrarily designed structures and precise measuring technology have enabled unprecedented manipulation of sounds in various engineered acoustic topological metamaterials. This session focuses on the fundamental physics, numerical modeling and experimental realization of acoustic topological metamaterials in both Hermitian and non-Hermitian systems, leading to novel topological effects and new applications of functional devices.