Digital transformation has emerged as one of the main strategic priorities of large organizations that are aiming at increasing the level of efficiency of their operations, their competitiveness, and the longer-lasting value generation. However, even with the intensive investment in innovative technologies, most businesses are unable to achieve quantifiable benefits because of the poor connections of digital projects with the governance system. This paper examines the manner in which IT governance maturity, operationalized with the internationally acknowledged frameworks, including COBIT and ITIL, leads to business value, ROI, and operational efficiency within large organizations that are in the midst of digital transformation. The data collected by the study through a cross-sectional empirical design is based on primary survey data of senior IT and business leaders and secondary organizational performance data to explore the quantitative relationships among the governance capability, implementation of digital strategies, and performance results. In testing the testing of the direct and the moderating impacts of governance maturity on the digital transformation success, structural equation modelling (SEM) is used. The results show that organizations that are more mature in IT governance have much more adequate alignment of technology investments with enterprise goals, which lead to greater process reliability, better cost efficiency, and higher ROI on digital endeavors. Findings also indicate that a clear strategy of digital transformation increases the influence of the governance maturity by increasing transparency of the decisions made, the managing of risks as well as collaboration across functions. The study adds to the existing body of knowledge on governance and digital transformation by combining both areas of study into a single empirical framework, and to practice by providing practical implications to CIOs, CTOs, and policymakers that aim to streamline governance frameworks. The results highlight why powerful governance tools are required to make sure that technological investments can bring about a sustainable measurable business value.