In 1947 a pamphlet called Catholicity: A Study in the Conflict of Christian Traditions in the West was published in London. It sought to state the intellectual vision of the Catholic movement within the Church of England on the great question of Union. But this was not merely a document produced by a particular party for its own purposes. It had been invited by the Archbishop of Canterbury and would inspire at least two other comparable reports of significance in response, one by evangelicals in the church and another by leaders of the British Free Churches. This article examines the contexts which created Catholicity, its significance as a moment in Anglican history and its distinctive contribution to the intellectual life of the wider Church. It also presents a discussion of the three figures who oversaw its production: Archbishop Geoffrey Fisher; Michael Ramsey (then a Professor of Divinity at the University of Durham); and the influential liturgical scholar Dom Gregory Dix.