Lamech (; Lemeḵ) is a person in Cain's genealogy in the 4th chapter of the Book of Genesis. He is the sixth generation descendant of Cain (Genesis 4:18); his father was named Methusael, and he was responsible for the "Song of the Sword". He is also noted as the first polygamist mentioned in the Bible, taking two wives, Adah and Zillah (Tselah).