Ekkathat (, ) or Borommoracha III () or King of Suriyamarin Throne Hall () was the 6th monarch of the Ban Phlu Luang dynasty, the 33rd and the last monarch of Ayutthaya Kingdom, ruling from 1758 to 7 April 1767, prior to the fall of Ayutthaya. Moreover, he was called by the people in his time as "King Khiruean" (), which meant "the king with skin disease", due to his chloasma.