The Dublin U-21's claimed a nine point victory over Roscommon to win their third All-Ireland in five years.
It finished Dublin 1-21. Roscommon 3-06.
The Dubs full forward line of Cormac Costello, Paul Mannion and man of the match Conor McHugh tore the Rossies apart in the first half.
The Dubs went in at the break 14 points to 1 in front.
Conor McHugh hit the back of the net shortly after half time to make it 1-17 to 0-01. It looked like it was game over, but Roscommon then hit three goals in six minutes to get right back into the game.
But the Boys in Blue hit four more points to hold on for a fine win.
