In the Epic of Gilgamesh, Utnapishtim parallels Noah as the Mesopotamian flood survivor.
Utnapishtim appears in the eleventh tablet of the standard version of the Epic of Gilgamesh. He tells Gilgamesh how the god Ea warned him to build a large boat and preserve life before a devastating flood. After surviving, Utnapishtim and his wife receive a special form of immortality.
The story shares several broad elements with Genesis: divine warning, a large vessel, preservation of living creatures, a destructive flood, birds sent out to test the waters, and a sacrifice after survival. Scholars compare these narratives as part of the ancient Near Eastern flood-story tradition, while also noting important differences in names, theology, chronology, and details.
Atrahasis is another important Mesopotamian flood hero, found in the earlier Atrahasis Epic. He is therefore a related figure, but Utnapishtim is the name used in the Epic of Gilgamesh, the specific work asked about here.