The 2004 All-Ireland Under-21 Hurling Championship final was a hurling match that was played at Nowlan Park, Kilkenny on 18 September 2004 to determine the winners of the 2004 All-Ireland Under-21 Hurling Championship, the 41st season of the All-Ireland Under-21 Hurling Championship, a tournament organised by the Gaelic Athletic Association for the champion teams of the four provinces of Ireland.