Abstract This special collection presents research articles and reviews on the preparation of new perovskite and perovskite‐related materials, and various aspects of their physicochemical properties as well as case studies on the development and characterization of perovskite‐based devices. These works serve as an illustration of the richness and directions of current research in the vibrant and fertile landscape of metal halide perovskites and perovskite‐based photovoltaics.