This research studies the emergence and evolution of the Saudi administrative law using the historical methodology of scientific research for legal sciences. The research concluded that the emergence of the administrative law in the Kingdom began early, due to the need for it at the establishment of the State. The beginning of the development of the administrative law was simple. All administrative laws in the Kingdom did not depart from the framework of Sharia, as stipulated in the Basic Law of Governance. In Najd, in the early days of the reign of King Abdul Aziz, there was no stipulated administrative law, but the governor of the region was the administrative ruler who had all the powers to implement the provisions and apply the public interest, and there was no form of central administration. After the announcement of the unification of the Kingdom, two things happened: The selection of a crown prince, the development of the level of services and its impact on the administrative organization, and the development of the administrative organization after the establishment of the Council of Ministers. In each of the reigns of the kings of the kingdom, there was a development in the establishment of new ministries and agencies that helped in the organization.