While Nietzschea (TM)s influence on philosophy, literature and art is beyond dispute, his influence on sociology is often called into question. A close textual analysis of Nietzschea (TM)s works and those of important sociologists a " Max and Alfred Weber, Ferdinand TAnnies, Rosa Mayreder a " provides the first comprehensive account of their study and use of Nietzschea (TM)s writings. Above all, Nietzschea (TM)s critique of modernity, morality and culture are shown to have had a decisive influence on the development of sociology and the work of its leading thinkers at the end of the 19th century and the beginning of the 20th.