This book offers a detailed account of the legal issues concerning the British Indian Ocean Territory (Chagos Islands) by leading experts in the field. It examines the broader significance of the ongoing Bancoult litigation in the UK Courts, the Chagos Islanders' petition to the European Court of Human Rights and Mauritius' successful challenge, under the UN Convention of the Law of the Sea, to the UK government's creation of a Marine Protected Area around the Chagos Archipelago. This book, produced in response to the 50th anniversary of the BIOT's founding, also assesses the impact of the decisions taken in respect of the Territory against a wider background of decolonization while addressing important questions about the lawfulness of maintaining Overseas Territories in the post-colonial era.