Abstract: The main purpose of this study is to investigate the impact of corporate board and audit committee characteristics on voluntary disclosures of listed manufacturing companies in Sri Lanka. In order to achieve the objective of the study, data were collected from annual reports of listed manufacturing companies, which were published by Colombo stock exchange in Sri Lanka for the period of 2012 to 2017. Descriptive and inferential statistics were used for this purpose for the study. Based on content analysis of disclosure, the empirical results of multiple regressions revealed that significant positive impact of board size on voluntary disclosures. Further CEO duality has significant negative impact on voluntary disclosures. Conversely board independence and audit committee size do not have any impact on voluntary disclosure of manufacturing companies in Sri Lanka. The outcome of the study offer evidence to policy makers, investors and accounting professionals on corporate reporting processes of listed manufacturing companies in Sri Lanka.