Ningishzida, in Mesopotamian religion, Sumerian deity, city god of Gishbanda, near Ur in the southern orchard region. Although Ningishzida was a power of the netherworld, where he held the office of throne bearer, he seems to have originally been a tree god, for his name apparently means “Lord Productive Tree.” In particular, he probably was god of the winding tree roots, since he originally was represented in serpent shape. When pictured in human form, two serpent heads grow from his shoulders in addition to the human head, and he rides on a dragon. He was a son of Ninazu and Ningirda and was the husband of Ninazimua (Lady Flawlessly Grown Branch).