In this article, evidence is briefly presented for three facts that together point to something puzzling. (1) That major continental philosophers of the nineteenth century tended to engage in some detail, as part of a broader preoccupation with ancient Greek thought, with Pyrrhonian scepticism. (2) That major continental philosophers of the twentieth century tended to engage in some depth with their nineteenth-century forebears and maintained their tendency to engage significantly with ancient Greek thought. (3) That twentieth-century continental philosophers demonstrate little (...) to no interest in Pyrrhonian scepticism. This raises the question: why does engagement with Pyrrhonism disappear from continental philosophy? The article discusses two hypotheses that might explain this disappearance. (shrink)