The purposes of this study is to assess the extent of Anti-Corruption Disclosure (ACD) practices of Indonesian Companies. Further, the study examines the board characteristics influencing the extent of ACD of Indonesian companies. A checklist consists of 40 items was adopted from Joseph et al. (2016) in order to assess the extent of ACD. Sustainability and annual reports of 2018 from 72 companies in Indonesia were used for the data of the study. The results showed that the extent of ACD were considerably good, as more than half of the sample companies scored more than 50% for extent of ACD. This results is also higher than other countries, such Malaysia and some Gulf Cooperative Council countries. The multiple regression analysis revealed that board meeting had an impact on the extent of ACD. The findings indicate that there should be more improvement for the content of sustainability report to accommodate the information relating to anti-corruption initiatives practiced by the companies. The regulatory authority may play significant role in advising and assisting the companies to enhance the content of sustainability report. In addition, the frequent of board meeting could be strategically managed to overcome the issues relating to anti-corruption and bribery initiatives.