| All Ireland Champions | |
|---|---|
| Winners | Kilkenny (5th win) |
| Captain | Jamesie Brennan |
| All Ireland Runners-up | |
| Runners-up | Tipperary |
| Captain | John Leahy |
| Provincial Champions | |
| Munster | Tipperary |
| Leinster | Kilkenny |
| Ulster | Down |
| Connacht | Not Played |
|
← 1989
1991 →
|
|
The 1990 All-Ireland Under-21 Hurling Championship was the 27th staging of the All-Ireland Under-21 Hurling Championship since its establishment by the Gaelic Athletic Association in 1964. The championship ended on 9 September 1990.
The championship was won by Kilkenny who secured the title following a 2-11 to 1-11 defeat of Tipperary in the All-Ireland final. This was their fifth All-Ireland title, their first in six championship seasons.
Tipperary were the defending champions.
Quarter-final
Semi-finals
Final
Semi-finals
Final