The Function of Law in the International Community, first published in 1933, is one of the seminal works on international law. Its author, Sir Hersch Lauterpacht, is widely considered to be one of the great international lawyers of the 20th century. It continues to influence those studying and working in international law today. This republication once again makes this book available to scholars and students in the field. It features a new introduction by Professor Martti Koskenniemi, examining the world in which the Function of Law was originally published and the lasting legacy of this classic work.