The Lyell Medal is a prestigious annual scientific medal given by the Geological Society of London, equal in status to the Murchison Medal. This medal is awarded based on one Earth Scientist's exceptional contribution of research to the scientific community. It is named after Charles Lyell.

The Geological Society of London, known commonly as the Geological Society, is a learned society based in the United Kingdom. It is the oldest national geological society in the world and the largest in Europe, with more than 12,000 Fellows.