Gerard Mathieu Leman (8 January 1851 Liège – 17 October 1920 Liège) was a Belgian general. He was responsible for the military education of King Albert I of Belgium. During World War I he was the commander of the forts surrounding the Belgian city of Liège. The German Forces had to use heavy artillery to break through the defences and capture Leman as a prisoner of War. He was released at the end of the war and died a hero, in 1920.