The Epic of Gilgamesh contains an ancient story of a flood which has been compared to the flood during the time of Noah mentioned in the Book of Genesis, Chapters 6-9. In the Gilgamesh version, found in Tablet 1.108, Gilgamesh is told the story of a flood during his search for everlasting life. The link below has more information about the Epic of Gilgamesh, but although there are references to how Gilgamesh was born, there is no creation myth in the story.
In the first tablet I believe, there is a referance the goddes Aruru making Enkidu from clay and spit, similar to how God created Adam from the dust. That's the closest to the creation story that is mentioned.