This thesis aims to explore Nietzsche's concept of individuality. Nietzsche, a radical and innovative thinker who attacks Christian morality and proclaims the death of God, provides us with a self-interpreting way to understand humanity and affirm life through self-overcoming and self-experimentation. Nietzsche's concept of individuality is his main philosophical concern. I first compare his perspective on human nature in Human, All Too Human, Daybreak and Beyond Good and Evil with Charles Darwin's, Sigmund Freud's and St Augustine's in order to examine how his thinking differs from theirs with regard to the concept of human nature. Second, I turn to his On the Genealogy of Morals, in comparison with the thought of John Stuart Mill, analys...