This book examines the formation, nature and effect of the arbitrators’ contract, addressing topics such as the appointment, challenge, removal and duties and rights of arbitrators, disputing parties and arbitration institutions. The arguments made in the book are based on a semi-autonomous theory of the juridical nature of international arbitration and a contractual theory of the legal nature of these relationships. From these premises, the book analyses the formation of the arbitrator’s contract in both ad hoc and institutional references. It also examines the institution’s contract with the disputing parties and its effect on the arbitrator’s contract under institutional references. The book draws from national arbitration laws and institutional rules in various jurisdictions to give a global view of the issues examined in it. The arbitrator’s contract is analysed from a global perspective of arbitral law and practice with insights from various jurisdictions in Africa, Asia, Europe, North and South America.