Reu or Ragau (Hebrew: רְעוּ,Re'u ISO 259-3 Rˁu) in Genesis was the son of Peleg and the father of Serug, thus being Abraham's great-great-grandfather.
He was 32 when Serug was born and lived to the age of 239 (Genesis 11:20), according to the Masoretic text. The Septuagint and Samaritan Pentateuch state that his age on fathering Serug was 132, and the Septuagint thus gives age at death as 339.