The 2011 O'Byrne Cup was a Gaelic football competition played by the teams of Leinster GAA.
The competition differs from the Leinster Senior Football Championship as it also features further education colleges and the winning team does not progress to another tournament at All-Ireland level.
This edition of the O'Byrne Cup began on 9 January 2011.
The eight winning teams from the first round of the O'Byrne Cup went on to qualify for the quarter finals of the tournament.
The losers of the first round went on to the O'Byrne Shield quarter finals.