Hyper-Kamiokande (also called Hyper-K or HK) is a neutrino observatory and experiment under construction in Hida, Gifu and in Tokai, Ibaraki. It is conducted by the University of Tokyo and the High Energy Accelerator Research Organisation (KEK), in collaboration with institutes from over 20 countries across six continents. As a successor to the Super-Kamiokande (also known as Super-K or SK) and T2K experiments, it is designed to search for proton decay and detect neutrinos from natural sources, such as the Earth, the atmosphere, the Sun, and the cosmos, as well as to study neutrino oscillations of the man-made accelerator neutrino beam. The start of data collection is planned for 2027.