This collection of mostly classic and some less well-known essays focuses on the historical question whether transnational citizenship is a genuinely new phenomenon and the normative question how it can be reconciled with principles of equal status and rights of citizens. The book opens with a introductory essay on the concept and the academic debates it has triggered. Its nineteen other chapters are grouped into five sections focusing on historical trends, institutional change, shifting boundaries, transnationalism from below and inter-state relations.