Leinster group may refer to: Leinster group, in mathematics, a group-theoretic analogue of the perfect numbers Leinster group, a group of moraines and other remains of ancient glaciation of Mount Leinster in Ireland The Leinster group of Nickel deposits, mined near Leinster, Western Australia Several province-based groupings of Irish sport: The Leinster Group of the 1925–26 National Football League (Ireland) The Leinster group stage of the 2015 All-Ireland Senior Hurling Championship The Leinster group stage of the 2016 All-Ireland Senior Ladies' Football Championship