2003 All-Ireland Under-21 Hurling Championship
The 2003 All-Ireland Under-21 Hurling Championship was the 40th staging of the All-Ireland Under-21 Hurling Championship since its establishment by the Gaelic Athletic Association in 1964.
Limerick were the defending champions, however, they were defeated in their quest for a record-equalling fourth successive All-Ireland title by Cork in the Munster semi-final.
On 21 September 2003, Kilkenny won the championship following a 2-13 to 0-12 defeat of Galway in the All-Ireland final. This was their 8th All-Ireland title in the under-21 grade and their first in four championship seasons.Results
Quarter-finals
Semi-finals
FinalQuarter-finals
Semi-finals
FinalFinalSemi-finals
FinalMiscellaneous
;Overall
| Rank | Player | County | Tally | Total | Matches | Average |
| 1 | Eoin Kelly | Tipperary | 2-22 | 28 | 3 | 9.33 |
| 2 | Shane Hennessy | Kilkenny | 1-21 | 24 | 5 | 4.80 |
| 3 | Conal Keaney | Dublin | 2-17 | 23 | 3 | 7.66 |
| 4 | Ger Farragher | Galway | 1-17 | 20 | 2 | 10.00 |
;Single game
| Rank | Player | County | Tally | Total | Opposition |
| 1 | Ger Farragher | Galway | 1-10 | 13 | Tipperary |
| 2 | Conal Keaney | Dublin | 1-09 | 12 | Westmeath |
| 3 | Paul Doherty | Derry | 1-08 | 11 | Down |
| 4 | Eoin Kelly | Tipperary | 0-10 | 10 | Galway |
| 5 | Andrew O'Shaughnessy | Limerick | 2-03 | 9 | Waterford |
| 5 | Shane Hennessy | Kilkenny | 1-06 | 9 | Offaly |
| 5 | Eoin Kelly | Tipperary | 1-06 | 9 | Clare |
| 5 | Eoin Kelly | Tipperary | 1-06 | 9 | Cork |
| 9 | Shane O'Neill | Dublin | 2-02 | 8 | Wexford |
| 9 | Andrew Quinn | Clare | 1-05 | 8 | Kerry |
| 9 | Pat Kirby | Limerick | 1-05 | 8 | Cork |
| 9 | Brian Dowling | Kilkenny | 1-05 | 8 | Down |
| 9 | Paul Braniff | Down | 1-05 | 8 | Kilkenny |
