This article seeks to identify a vein of ‘Puritanism’ running through orthodox religious culture in England over the century or so prior to the Break with Rome. It suggests that alongside the strong emphasis on the sensual and material in worship, it is possible to identify a current of austere and moralistic teaching, which was guarded or sceptical about the value of relics, images and pilgrimage. In the religious ferment around the turn of the fifteenth century, such attitudes developed alongside the forms of heterodoxy known as Lollardy, but were often explicitly anti-Lollard in intention. The article argues further that the strain of ‘puritanical’ Catholicism survived and developed through the fifteenth century, and into the sixteenth, partly as a consequence of the ability of print to preserve and promote old arguments. It converged with currents of Christian humanism, as well as providing a point of connection and reception for emergent evangelical ideas in the 1520s and later. The article thus aims to shed new light on the proposition that the origins of the Reformation are best looked for within the confines of late medieval orthodoxy.