This brief encyclopedia is a guide to the amazing world of uranium, a metal without which it is impossible to imagine modern humanity. Here are many interesting facts about the history of discovery, research and use of uranium. The material is presented in a popular science form and does not require special training. First of all, a brief encyclopedia of uranium is intended for high school students of secondary educational institutions and junior students of universities who want to study in more detail issues related to the history of uranium and its importance for the innovative economy.