The 2008 All-Ireland Under-21 Football Championship was the 45th staging of the All-Ireland Under-21 Football Championship since its establishment by the Gaelic Athletic Association in 1964.
Cork entered the championship as defending champions, however, they were defeated by Kerry in the Munster semi-final.
On 3 May 2008, Kerry won the championship following a 2-12 to 0-11 defeat of Kildare in the All-Ireland final. This was their 10th All-Ireland title overall and their first in ten championship seasons.
Semi-finals
Final