The Transboundary Haze Pollution Act (THPA) is a statute passed by the Parliament of Singapore in 2014. The law criminalizes conduct that causes or contributes to haze pollution within Singapore, providing legal mechanisms and deterrence against cross-border environmental damage.

The legislation is designed to allow civil and criminal legal action against entities and companies that engage in or contribute to land and forest fires outside the country that lead to unhealthy air quality in Singapore. During regional transboundary haze events, such as those caused by land clearance and fires in neighboring countries, Singaporean authorities rely on the law to investigate and pursue actions against allegedly responsible entities where warranted.