Leonard Woolf, colonial civil servant, Fabian intellectual, and prominent member of the Bloomsbury circle, was one of the most prolific writers about international issues during the first half of the twentieth century. This book is the first systematic study of his international political thought. It explores his views on such topics as international government, imperialism, international economic organization, and realism. Wilson shows that the designation of 'idealist' or 'utopian' for Woolf and like-minded thinkers is inappropriate. In many respects Woolf was a highly prescient thinker, and, paradoxically, shares much common ground with E.H. Carr, the premier realist of the era. The book also draws attention to the importance of Woolf's contribution to the growth of IR theory and to the current scholarship on international governance, global civil society, and regime theory.