The Leinster School's Senior Development Cup is the entry level rugby union competition for secondary schools newly affiliated to the Leinster Branch of the IRFU.
Senior Schools Cup Rugby is divided into 4 tiers in two sections and each cup competition bears a name as follows: Section A Leinster Schools Rugby Senior Development Cup (effectively division 4), Section A Leinster Schools Rugby McMullen Cup (effectively division 3), Section B Leinster Schools Vinnie Murray Cup (effectively division 2), Section B Leinster Schools Senior Cup Challenge Cup (effectively division 1).