The study aims at investigating the relationship between corporate governance and accounting conservatism of Vietnamese companies, using collected data of the 69 non-financial companies in period 2015-2021. The Givoly & Hayn (2000) indexis used as proxy for accounting conservatism. The corporate governance includes board characteristics, ownership structure and audit quality. Our results show that board independence and ownership concentration have positive effect on ccounting conservatism; while institutional ownership and board size have negative impact on accounting conservatism. Managerial ownership, CEO duality and audit quality, on the other hand, are not statistically significant Our research findings indicate that prioritizing the enhancement of corporate governance quality can address the agency problem, improve financial reporting quality, and ultimately enhance market efficiency