Tudhaliya III was a short-lived king of the Hittite Empire (New Kingdom) ca. 1370 BC (middle chronology) or 1344 BC (short chronology); he may have been the son and successor of Hattusili II, however he is normally viewed as the son and immediate successor of Tudhaliya II (according to the king count used here). He is never explicitly known to have been king at all. The Hittite texts refer to him as "Tudhaliya the child" or, as an alternate translation, "Tudhaliya the Young(er)". He was killed by a group of officers that included his successor, and quite probably brother, Suppiluliuma I.
There is some difficulty concerning numbering of the Tudhaliyas (and Hattusilis) of the Hittite empire. This Tudhaliya is normally not included in Hittite king lists, and his father will often be seen listed in modern literature as Tudhaliya III.
^King (lugal) of Tarhuntassa (Bryce 1997, p. 296); apparently later Great King of Hatti (Bryce 1997, p. 354).
^Nerikkaili married a daughter of Bentesina, king of Amurru (Bryce 1997, p. 294).
^Two daughters of Hattusili III were married to the pharaoh Ramesses II; one was given the Egyptian name Ma(hor)nefrure. Another, Gassuwaliya, married into the royal house of Amurru. Kilushepa was married to a king of Isuwa. A daughter married into the royal family of Babylon. A sister of Tudhaliya IV married Sausgamuwa, king of Amurru after his father Bentesina. From Bryce (1997), pp. 294 and 312.