Rukibtu (Akkadian: 𒊒𒌑𒄒𒌅 𒌉 ru-ú-kib-tu)^[1] or Rukibti (Akkadian: 𒊒𒄒𒋾 ru-kib-ti)^[2] was a king of Ascalon in the 8th century BC, when Philistia was a dependency of the Neo-Assyrian Empire. After his predecessor Mitinti I instigated an unsuccessful rebellion against the emperor Tiglath-Pileser III in Ashkelon, Rukibtu deposed him and usurped the throne for himself. Tiglath-Pileser III's annals call him "Rukibtu, son of [...]" - the name of his father has not survived. Some scholars have suggested that his father was Mitinti I, however, kings of ignoble origins were often called "son of a nobody" in Assyrian and Babylonian sources, and with Rukibtu having usurped the throne, this possibility cannot be ruled out.^[3]

Rukibtu was succeeded by Sidqa, who also instigated a failed revolt against Assyrian authority. Sennacherib then deposed Sidqa, and placed Rukibtu's son Šarru-lu-dari on the throne of Ashkelon.