The Leinster Senior League Senior Division is the top division of the Leinster Senior League. It is organized by the Leinster Football Association. Together with the Munster Senior League Senior Premier Division and the Ulster Senior League Senior Division, it forms the third level of the Republic of Ireland football league system. Formed in 1896, it is the oldest association football league in what is now the Republic of Ireland. Shelbourne have won the most titles. However, in more recent seasons Crumlin United, Cherry Orchard, Wayside Celtic and Bangor Celtic have been the divisions strongest teams. In 2014–15 Bluebell United were Leinster Senior League champions, twenty seven years after winning their previous title.Clubs from this division play in the Leinster Senior Cup, the FAI Cup,