This descriptive and analytical research conducted to investigate the relationship between the advent and spread of Islam and its reflections on the development and growth of the Arabic language from one side, and link that with the contemporary principle, concepts and theories of language planning from the other side. The coming and spread of Islam has made major procedures that have enhanced the status, corpus and acquisition of Arabic. They include selection, standardization and codification of the Arabic language as the official language for the Muslim community and state. The advent of Islam has made great linguistic changes to the Arabic language components including its phonetics and phonology, morphology, syntax and semantics. These procedures have changed the Arabic status from a language of local tribes to an international language spoken by about 450 million in the world; it has also become the native and official language for 22 countries and the liturgical language for about 1.7 billion Muslims. Learning and disseminating Arabic is enhancing, booming and increasing worldwide.