Tudḫaliya IV was a king of the Hittite Empire (New kingdom), and the younger son of Ḫattušili III.

Tudḫaliya had a sister, Maathorneferure, who served as Great Royal Wife to Pharaoh Ramesses II of Egypt.

Tudḫaliya IV responded by building at least 13 dams to secure water supplies, one of which still survives to this day at Alacahöyük.

A clay tablet (CTH 121), dating to the reign of Šuppiluliuma II, tells that a statue was set up by Tudḫaliya IV to commemorate his conquest of the Land of Alasiya (Cyprus?).

Tudḫaliya IV had two sons, Arnuwanda III and Šuppiluliuma II, who are considered the final two kings of the Hittite Empire.