Ur-Lumma (Sumerian: 𒌨𒀭𒈝𒂷, ) was a ruler of the Sumerian city-state of Umma, circa 2400 BCE. His father was King Enakalle, who had been vanquished by Eannatum of Lagash. Ur-Lumma claimed the title of "King" (Lugal). His reign lasted at least 12 years.
Ur-Lumma again entered in a territorial conflict with Lagash, for the fertile plain of Gu-Edin. Ur-Lumma, attacked Lagash and its king Enannatum, successor of Eannatum, managing to "destroy with fire the stele of Eannatum and the shrines of the gods set up beside it". Ur-Lumma vanquished Enannatum and occupied Lagash, but he was eventually repelled by Entemena, the son of Enannatum.
Ur-Lumma was replaced by his nephew Illi, a priest-king, who also attacked Lagash, but was again defeated by Entemena.
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Votive plate of Queen Bara-irnum of Umma, "wife of Gishakidu, king of Umma, daughter of Ur-Lumma, king of Umma, grand-daughter of Enakalle, king of Umma, daughter-in-law of Il, king of Umma", to God Shara, in gratitude for sparing her life. -
The name "Ur-Lumma" (𒌨𒀭𒈝𒂷) on the plate of his daughter Bara-irnun (third column)