This book addresses the meaning of contemporary social democracy and how the centre-left is navigating through its current identity crisis, through a series of multiple cases of social democratic and labour parties across Europe and the Anglosphere. The book examines the ideological, policy, electoral and organisational dilemmas facing the centre-left. Taking in cases including the UK, Austria, France, Germany, Scandinavia, Australia and New Zealand, it outlines and explores the current and future trajectories of the family of centre-left parties. This text will be of key interest to students, scholars and interested readers of labour and social democratic politics, centre-left political parties, trade unions, the future of the centre-left, and more broadly to those studying political parties, European and comparative politics.