This research aims to study and test the effect of Ownership Structure on the Transparency in the financial reports of Egyptian Shareholding Companies through Answering the Research Question: What is The Effect of Ownership Structure on The Disclosure Transparency? Using a sample of 60 Egyptian Shareholding Companies within the period from 2012 to 2018, The Researcher used multiple linear regression model, the model included Five Independent Variables (Ownership Concentration, Institutional Ownership, Insider Ownership, Foreign Ownership, Family Ownership), Three Control Variables (Firm Size. Leverage, Rate of return on assets) and Dependent Variable (Transparency), An hypothesis was Formulated for each of the independent variables and their effect on the dependent variable was tested, The Results Showed that there is a Positive relationship between ownership concentration, Institutional Ownership, Firm size and Disclosure Transparency, but Negative relationship between Insider Ownership and Transparency and non-relationship between other variables and Disclosure Transparency.