Utnapishtim is the ark's occupant who survives the flood in the Epic of Gilgamesh.
In the standard version of the Babylonian Epic of Gilgamesh, the god Ea warns Utnapishtim that the gods intend to send a devastating flood. Utnapishtim builds a large vessel, brings aboard his family, craftsmen, and animals, and survives the storm. Afterward, he sends out birds to learn whether the waters have receded.
The episode resembles the Genesis Flood narrative in several details, including divine warning, a large boat, preservation of living creatures, and released birds. Utnapishtim is not Noah, however; he belongs to Mesopotamian literature and has a different story and cultural setting.
The flood account in Gilgamesh is closely related to the older Atrahasis tradition. In some discussions, Atrahasis is treated as a parallel flood hero, but Utnapishtim is the name specifically used in the Epic of Gilgamesh.