Karl Vorländer (1860-1928) was a German philosopher, historian of philosophy, and Neo-Kantian. He is mainly known for his studies on Immanuel Kant and for his work in disseminating critical philosophy. He edited several works by Kant and wrote influential books about his life and thought, such as his biography "Immanuel Kants Leben" and "Kant und der Sozialismus". Vorländer was an important figure in the Neo-Kantian movement of the Marburg School.