Chiral Perovskite Materials In article number 2005760, Jooho Moon and co-workers discuss recent advances in the chiroptical activities of chiral organic–inorganic hybrid halide perovskites (OIHPs) and polarization-based devices adopting chiral OIHPs. They also present insight into the underlying chirality-transfer mechanism based on theoretical considerations. Chiral OIHPs have a wide variety of applications, such as spin light-emitting diodes, spintronics, biosensing, and optoelectronic devices.