The chapter looks in detail at Churchill’s post-Second World War campaign for European unity. It begins by explaining the concepts of ‘the English-speaking peoples’ and ‘Christian civilisation’ that informed his thinking, before outlining the evolution of his thought through exposure to the ideas of Coudenhove-Kalergi and Briand. Prior to the Second World War, Churchill stated explicitly that Britain should not be a member of a proposed United States of Europe, but his ideas continued to evolve. In 1940 his government made the offer of Franco-British Union, and by 1942 he was promoting the idea of a Council of Europe as a counterweight to Russian ‘barbarism’. Defeated at the 1945 election, his Zurich speech and ensuing United Europe campaign are seen within the context of his desire to demonstrate his continued relevance on the world stage and against the backdrop of the developing Cold War. Nonetheless, they were based on sincere beliefs that helped inspire a broader transnational movement. The chapter concludes with the ambiguities in Churchill’s views on the role of Britain in Europe and argues that they may be a ‘problematic guide’ to more recent European politics.