Robert "Rob" Gretton (15 January 1953 – 15 May 1999), was the manager of Joy Division and New Order. He was partner in and co-director of Factory Records and a founding partner of The Haçienda.
In 1977, Gretton became a leading figure in the Manchester punk scene with his involvement with Slaughter and the Dogs. He was DJ in Rafters club and manager of The Panik.
Gretton's involvement with the Manchester scene began when he contributed £200 to co-finance Slaughter and the Dogs' first single, the punk classic "Cranked Up Really High". After joining Factory Records in 1979 Gretton brought many new bands to the label, including Section 25, X-O-Dus, Crispy Ambulance, Stockholm Monsters, Minny Pops, The Names, Quando Quango, The Wake, 52nd Street and Happy Mondays.
In general, Gretton tended to prefer conventional bands with conventional songs, whereas Tony Wilson favoured avant-garde projects. The relationship between the pair is explored in depth in the book Shadowplayers by James Nice (2010).