Jacob (; Hebrew: יַעֲקֹב‎, Modern: Yaʿaqōv , Tiberian: Yaʿăqōḇ; Arabic: يَعْقُوب, romanized: Yaʿqūb; Greek: Ἰακώβ, romanized: Iakṓb), later given the name Israel, is regarded as a patriarch of the Israelites and is an important figure in Abrahamic religions, such as Judaism, Christianity, and Islam. Jacob first appears in the Book of Genesis, where he is described as the son of Isaac and Rebecca, and the grandson of Abraham, Sarah, and Bethuel. According to the biblical account, he was the second-born of Isaac's children, the elder being Jacob's fraternal twin brother, Esau. Jacob is said to have bought Esau's birthright and, with his mother's help, deceived his aging father to bless him instead of Esau. Later in the narrative, following a severe drought in his homeland of Canaan, Jacob and his descendants, with the help of his son Joseph (who had become a confidant of the pharaoh), moved to Egypt where Jacob died at the age of 147. He is supposed to have been buried in the Cave of Machpelah.

Jacob had twelve sons through four women, his wives, Leah and Rachel, and his concubines, Bilhah and Zilpah, who were, in order of their birth, Reuben, Simeon, Levi, Judah, Dan, Naphtali, Gad, Asher, Issachar, Zebulun, Joseph, and Benjamin, all of whom became the heads of their own family groups, later known as the Twelve Tribes of Israel. He also had a daughter named Dinah. According to Genesis, Jacob displayed favoritism among his wives and children, preferring Rachel and her sons, Joseph and Benjamin, causing tension within the family—culminating in Joseph's older brothers selling him into slavery.

Scholars have taken a mixed view as to Jacob's historicity, with archaeology so far producing no evidence for his existence.