2003 All-Ireland Under-21 Hurling Championship
| All Ireland Champions | |
|---|---|
| Winners | Kilkenny (8th win) |
| Captain | Jackie Tyrrell |
| Manager | Martin Fogarty |
| All Ireland Runners-up | |
| Runners-up | Galway |
| Captain | Fergal Moore |
| Manager | John Hardiman |
| Provincial Champions | |
| Munster | Tipperary |
| Leinster | Kilkenny |
| Ulster | Down |
| Connacht | Not Played |
← 2002 2004 → | |
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.