This study purposes to examine the relationship between audit committee attributes and sustainability disclosure level and the influence of audit quality on the relationship between audit committee attributes and sustainability disclosure level of the listed companies on the stock exchange of Thailand (SET) 2022. In this study, audit committee attributes are measured by audit committee’s size, independence, financial expertise and frequent meetings, sustainability disclosure level is measured by level of sustainability disclosure score and audit quality is measured by audit firm size. The results show that audit committee’s size, independence, financial expertise have no relationship with sustainability disclosure level, while audit committee’s frequent meeting has relationship with sustainability disclosure level. Moreover, audit quality has effect on the relationship between audit committee’s frequent meeting and sustainability disclosure level. The study findings indicate that audit committee’s frequent meeting has effect on sustainability disclosure level. In addition, a joint meeting between audit committee and auditor help to increase the level of sustainability disclosure.