The International Congress of History of Science and Technology, held every four years, is the world’s premier meeting for history of science and technology. The 27th Congress will be held as a hybrid in-person and online event at the University of Otago’s Dunedin campus in June-July 2025. Delegates registered for virtual participation will be able to both present and attend online. The Congress will bring together a diverse group of the world’s leading scholars and students in the fields of history of science, technology, and medicine as well as related disciplines. It will be the first time the Congress has been held in Australasia and only the second time in the Southern Hemisphere.