Somdet Phra Borommaracha Thirat IV or Somdet Phra Borommarachathirat No Phutthangkun, formerly Prince Athittayawong, is the breifly-reigning king of Ayutthaya from 1529 to 1533.

Prince Athittayawong is the son of Ramathibodi II and becomes the Uparaja in 1515.

Following his father's death, Athittayawong succeeds to the Ayutthayan throne as Borommaracha IV.