Sigmund Esco "Jackie" Jackson (born May 4, 1951) is an American singer best known as a founding member of the Jackson 5, for which he was inducted into the Rock and Roll Hall of Fame in 1997. Jackson is the second child of the Jackson family, and the oldest Jackson brother.

Sigmund Esco Jackson was born at St Mary's Mercy Hospital in Gary, Indiana, on his mother Katherine's 21st birthday in 1951. He was given the nickname Jackie by his grandfather, Samuel Jackson. He and his siblings (Michael, Marlon, Tito, Jermaine, Randy, Rebbie, La Toya, and Janet) were brought up in a two-bedroom house in Gary, Indiana, an industrial steel city south of Chicago.