On April 19, 1933, John Maynard Keynes delivered a lecture at University College Dublin on 'National Self-Sufficiency' to an audience that was largely composed of the political and intellectual elite of the still young Irish Free State. 'Keynes in Dublin' looks at the circumstances surrounding that famous lecture and particularly the political aspect of Keynes's visit at a time when relations between the new Free State government led by Eamon de Valera and the British government were greatly strained. In an important new contribution to Keynesian studies, the author provides a fresh way of looking at what Keynes had to say in his lecture. In particular, he demonstrates that the definitive version of 'National Self-Sufficiency' is not that included in Keynes's 'Collected Writings' but is the version published in the Irish journal 'Studies' in 1933, which also matches exactly a handwritten manuscript prepared by Keynes. He also shows that the lecture can only be fully understood within the context of the Irish political situation at the time of its delivery. The version of the lecture as published in 'Studies' is given in full in an appendix.