Umar (2nd Caliph) occupies a unique position in history. He is considered the greatest among conquerors, empire-builders, administrators and statesmen. He established Arabia as world-power. He set standards of republican democratic behaviour which have not been surpassed. He was the Head of the largest State of the world, but he lived the life of a common man. His greatness was acknowledged by the Holy Prophet (S.A.W.) when he said that if there were to be any Prophet after him it would have been Umar. While Umar was not a prophet, he did things which prophets have done. He was a man of strong character and strong will who made history. There are not many authentic books available in English on him, so the author considered the matter and produced this biography of Umar. He analysed all the events in detail and evaluated him with great honour and honesty. Its language is simple and comprehensive. This book will be useful for the teachers, students and other inquisitive readers.