With a view to suggesting the possible relevance of Aristotelian thought to current notions of complexity and self-organization, studies Aristotle’s notions of teleology and final causation. After a sketch of the historical process by which such notions were finally rejected in the science of Galileo and Newton, attention is drawn to some contemporary trends in philosophy of science that argue for a return to some (modified) versions of the notion of final causation (I. Prigogine, R. Thom, S. Rosen). These arguments are illustrated by the example of Bénard cells, and the theories of Schneider, Kay, and D. Sagan.