The aim of the research is to compare between the Omani and Egyptian legal texts regarding the resposibility of the supervisor and the regulations governing it. It elaborates on the nature of the supervisor's responsibility, the basis upon which this liability is founded, how it can be negated, and the necessary conditions for its establishment. The research also addresses the right of recourse for both the supervisor and the supervised party regarding compensation, concluding with several key findings: The supervisor's obligation stems from the law or agreement, The basis of the supervisor's liability in Omani law is presumed fault, The supervisor may negate liability by proving the performance of supervisory duties or by negating causation, The supervisor in Omani law is consistently responsible, The researcher recommends that Omani legislation follows the Egyptian approach where the supervisor is considered primarily responsible when the supervised party is not discernible. Additionally, the researcher suggests that criminal laws should address the supervisor's liability to increase their vigilance over those under their supervision. The researcher approached the topic in two chapters, opening with a chapter titled "The Concept of Supervisor Liability for Whom Supervision Is Required." The second chapter delves into the basis and establishment of civil supervisor liability and how it can be negated Key words: In charge of oversight, Controlled, Guardian, Trustee.