In this paper I will explore the paradoxical relationship between anarchism and utopianism, and examine the significance of utopian thinking for radical politics more generally. I will suggest that there has always been a utopian dimension in anarchist thought, not only in the more consciously utopian imagination of Le Guin, Morris and Landauer, but even in the ‘scientific’ anarchism of Kropotkin and Bakunin. However, in the case of the latter, I would argue that two opposed understandings of utopianism are at work here: firstly, the utopianism that is to be found in the positivist and rationalist paradigms present in classical anarchism – the idea of a rational social objectivity and an essentialist human subject whose unfolding coincides ...