The Expressway Authority of Thailand () (EXAT) is a state enterprise under the Ministry of Transport. It was founded in 1972, and operates Thailand's expressway ( thang phiset) system, which refers to (usually elevated) high-capacity controlled-access highways serving the Greater Bangkok area and some nearby provinces.
EXAT does not operate the separate Thai motorway network, which covers intercity controlled-access highways.
First opened in 1981, the system currently (2015) consists of seven expressways and four expressway links adding up to a total distance of , unchanged since FY2012. In 2013 the system served 594 million cars.
The constituent expressway systems are (in order of completion):
Fiscal year 2015 (year ending 30 September 2015) revenues were 16,060 million baht on total assets of 180,696 million baht. It employed 4,701 regular and 625 temporary employees in FY2015. EXAT's top seven executives were remunerated 12.9 million baht total in FY2015.