Mahalath was the third mentioned wife of Esau, a daughter of Ishmael and sister of Nebaioth. Esau took Mahalath from the house of Ishmael to be his wife, after seeing that Canaanite wives displeased his father, Isaac (Genesis 28:6-9).
It has been proposed by some biblical scholars that Mahalath is another name for Esau's wife Basemath who is mentioned in Genesis 36. John Phillips suggests that Esau changed the names of his Hittite wives, Judith and Basemath, as a way of pacifying his parents  for the grief he caused them when he married Canaanite women: since he had two wives in his life called Basemath, he had to change the Ishmaelite's name, of which he chose: Mahalath. (Genesis 28:6-9,36:2-3)
- Judith (Hebrew Bible), another wife of Esau