Tammaritu I, son of Urtak, was briefly (from 653-652 BCE)[1] a ruler in the ancient kingdom of Elam, ruling after the beheading of his predecessor Teumman in 653.

[2][3] Urtak, the father of Ummanigash and Tammaritu, had ruled Elam from 675 to 664, at which point he died and was succeeded by Teumman.

[5] Based on his position in an Assyrian lists, Tammaritu was likely a younger son of Urtak.

[6] The Assyrian Ashurbanipal, at the Battle of Ulai, killed Teumman, opening the way for the rule of Tammaritu and Ummanigash.

[6] Meanwhile, Ashurbanipal faced an attempt by his brother, Shamash-shum-ukin, king of Babylon, to take over the Assyrian Empire.