Hermann Haken is physicist and professor emeritus in theoretical physics at the University of Stuttgart. He is known as the founder of synergetics and one of the "fathers" of quantum-mechanical laser theory. He is a cousin of the mathematician Wolfgang Haken, who proved the Four color theorem. He is a nephew of Werner Haken, a doctoral student of Max Planck.

Wolfgang Haken was a German American mathematician who specialized in topology, in particular 3-manifolds.