Nam-mahani (, nam-maḫ-ni; died 2110 BC) was a Sumerian ruler, and the last ensi of Lagash, roughly contemporaneous with the last king of Akkad, Shu-turul. His reign was followed by that of Utu-hengal, who destroyed the power of the Gutian Dynasty, and put an end to the power of the various city-states, reunifying the Sumerian realm.
Nam-mahani is known from various inscriptions, and especially a macehead dedicated by queen Nininimgina and bearing the name of King Nam-Mahani, to god Kindazi: