Naturalism is the current orthodoxy in analytic philosophy. Naturalism is the conjunction of the (ontological) claim that all that truly exists are the entities countenanced by the natural sciences and the (epistemological) claim that the only true knowledge is natural-scientific knowledge. Drawing on some recent work in Critical Theory, this article argues that naturalism qualifies as an ideology. This is the case because naturalism meets three key aspects shared by paradigmatic cases of ideology: (i) naturalism has practical consequences and implications (...) of a specific kind, (ii) those endorsing naturalism fall prey to a dual deception: having false meta-level beliefs about naturalism as being without alternative, and (iii) naturalism has a tendency towards self-immunisation. The article ends by suggesting we pull naturalism out of our collective cognitive backgrounds onto the main stage of critical discourse, making it a proper topic for philosophical critique again. (shrink)