Mankind is having strong desire for global peace. During the twentieth century a number of international treatises were signed a treaty, declaring war as illegal in the settlement of disputes. Despite signing that declaration and many other conventions, there have still been wars and we have not seen the peace which was intended and agreed by the nations signatory to these conventions. These conventions failed to achieve the desired goal, because these human laws lack that moral and spiritual force which is essential for achievement of comprehensive peace. Without divine guidance and revealed truth, human laws lack force of conviction. Only divine moral laws can lead to universal peace and regulate human conduct for international brotherhood and love. Those moral laws can be recognized by human minds only if those minds are untarnished of all pride and prejudice. Within this context, we shall describe the Islamic principles for unity of mankind and mutual peaceful co-existence of different cultures and faiths. Among them the most important is common origin of mankind according to which all human beings have been created. So there should not be any discrimination based on clan, creed or race. The Quran negates distinction on the basis of racial, linguistic and national grounds and it also identifies diversity as a sign of Allah and hence to be respected. Different identities are for recognition – not for pride – and hence necessary and it should not lead to any conflict. Promoting divisiveness and hatred based on religious and cultural differences is absolutely against Islam.