This thesis came to address the fact that most recent studies and research do not refer to the historical Islamic roots of financial control and to show its importance and entitlement to the development of financial control until the present time. It also came to address the legal controls on financial control through contemporary Omani laws and legislation, by comparing contemporary laws in the Sultanate of Oman with regard to financial control with financial control in Islamic Sharia. Furthermore, the thesis shows the economic effects of financial control in Islam. The study plan consisted of an introduction and two chapters: Introduction: The concept and development of financial control in Islam. First Chapter: The legal principles of financial control and their jurisprudential and legal applications. Second Chapter: The economic effects of censorship in Islam - the Hesba system as a model. Among the most significant results of the research: the conformity of Sharia and Omani law on the existence of self-means on the bodies, in Sharia through the internal religious scruples of individuals, and in Omani law by submitting a financial disclosure statement to the state's financial and administrative control authority. Also, financial control has a significant impact on increasing production, due to the Muslim's compliance with the Sharia texts that require him to master the work. Moreover, Islam has set a set of legal controls and rules for commodity exchange, such as displaying goods in the market honestly and truthfully, and not manipulating prices, in addition to preventing false and misleading advertising.