Different forms of methodological and ontological naturalism constitute the current near-orthodoxy in analytic philosophy. Many prominent figures have called naturalism a image, a Weltanschauung, or even a “philosophical ideology”. This suggests that naturalism is indeed something over-and-above an ordinary philosophical thesis. However, these thinkers fail to tease out the host of implications this idea – naturalism being a worldview – presents. This paper draws on remarks of Dilthey and Jaspers on the concept of worldviews in order to demonstrate that naturalism (...) as a worldview is a presuppositional background assumption which is left untouched by arguments against naturalism as a thesis. The concluding plea is to re-organize the existing debate on naturalism in a way that treats naturalism not as a first-order philosophical claim, but rather shifts its focus on naturalism’s status as a worldview. (shrink)