Abstract: This study investigate the relationship between Relationship between Corporate Governance Attributes and Voluntary Disclosure Level of Sri Lankan manufacturing companies listed in Colombo Stock Exchange (CSE). The corporate governance attributes include ownership Concentration (OC), Board Independence (BI),CEO Duality (CD) and Number of Female Directors (FD).In here research use relative disclosure index for measuring voluntary disclosure level. Further researcher chose the 31 companies as sample of the study.