Borommatrailokkanat or Trailok (1431–1488) is the king of the Ayutthaya Kingdom from 1448 to 1488.

He is one of many monarchs who gain the epithet King of White Elephants.

He is the first Thai king to possess a "noble" or white elephant, which, according to Hindu belief, is a "glorious and happy sign".

His reign is also known for a massive reforms of Thai bureaucracy and a successful campaign against Lan Na.

He is revered as one of the greatest monarchs of Thailand.