| Type: | Under-21 |
| Year: | 2008 |
| Dates: | 28 May – 14 September 2008 |
| Teams: | 16 |
| Munster: | Tipperary |
| Leinster: | Kilkenny |
| Ulster: | Derry |
| Matches: | 17 |
| Team: | Kilkenny |
| Titles: | 11th |
| Captain: | James Dowling |
| Manager: | Michael Walsh |
| Team2: | Tipperary |
| Captain2: | Séamus Hennessy |
| Manager2: | Declan Carr |
| Previous: | 2007 |
| Next: | 2009 |
The 2008 Bord Gáis Energy GAA Hurling All-Ireland Under-21 Championship was the 45th staging of Ireland's hurling knock-out competition for players aged between 18 and 21. Kilkenny won the championship, beating Tipperary 2-13 to 0-15 in the final at Croke Park, Dublin.
Quarter-finals
Semi-finals
Final
Quarter-final
Semi-finals
Final
Table
| width=20 | width=150 | Team | width=20 | width=20 | width=20 | width=20 | width=40 | width=40 | width=30 | width=20 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Derry | 3 | 3 | 0 | 0 | 5-49 | 2-30 | 28 | 6 | ||||||||||
| 2 | Antrim | 3 | 2 | 0 | 1 | 4 | |||||||||||||
| 3 | Down | 3 | 1 | 0 | 2 | 1-34 | 5-42 | -20 | 2 | ||||||||||
| 4 | Armagh | 3 | 0 | 0 | 3 | 0 |
Group stage
Semi-finals
Final