This translation of the book 'International Relations Theory' is a joint work of Stephen McGlinchey, Rosie Walters and Christian Scheinpflug published by E-International Relations Publishing, London, UK. The translator deliberately did not change the original cover of this book, and only added the translation in Indonesian, namely, The Theory of International Relations as the title of this book in addition to the original title. The nature of this book is that it is an introductory book that deals with established IR theories and theory development ones.