Postage stamps are important means of communication and many countries have recorded important events, honored worthy individuals, and described interesting facts through this medium. Many historical facts, sometimes obscure, can be found on stamps; some of these may not be easily located in a history or a science book. Stamps have artistic value, they are created by artists. This article published in the Quarterly Journal of the International Atomic Energy Agency highlights the history of uranium. It is available in French, Spanish, Russian, Chinese beside English.