Serug () was the son of Reu and the father of Nahor, according to Genesis 11:20-23. He is also the great-grandfather of Abraham. In the Masoretic text that modern Bibles are based on, he was 30 when Nahor was born, and lived to the age of 230. (Other early versions give different figures).

He is called Saruch in the Greek version of Luke 3:35.

Further details are provided in Jubilees, where it gives the names of his mother, Ora (11:1), and wife Milcah (11:6). It also states that his original name was Seroh, but that it was changed to Serug in the time when Noah's children began to fight wars, and the city of Ur was built, where Serug lived. It says this Serug was the first of the patriarchal line to abandon monotheism and turn to idol worship, teaching sorcery to his son Nahor.

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