This article argues against ontology as an intelligible project for social theory. Ontological questions have proliferated in social thought in the past decades mainly as a way of recasting traditional sociological questions about individuals/society and structure/agency. Far from being an advance in our understanding, however, this form of reasoning has frequently brought confusion. This is demonstrated with detailed reference to a contribution from an ongoing debate, centred on the issue whether social structures are causally efficacious. I argue that the ontological (...) project is mainly fuelled by a misconception of language and that, once this picture is exposed as incoherent, ontology loses its intelligibility. (shrink)