This infodemiological study utilized Relative Search Volumes (RSV) from Google Trends. It determined changes in public interest in mental health after the implementation of the mental health laws of Malaysia, the Philippines, Singapore, and Thailand using search volumes from 2004 to 2021. It found that public interest in mental health increased in Malaysia, the Philippines, and Singapore after implementing their mental health laws. On the contrary, public interest in mental health continued to decrease in Thailand despite its mental health law implementation. This can be explained by the unequal prioritization of mental health among these countries.