| Type: | Under-21 |
| Year: | 1990 |
| Dates: | 6 June 1990 – 9 September 1990 |
| Munster: | Tipperary |
| Leinster: | Kilkenny |
| Ulster: | Down |
| Team: | Kilkenny |
| Titles: | 5th |
| Captain: | Jamesie Brennan |
| Team2: | Tipperary |
| Captain2: | John Leahy |
| Topscorer: | Jamesie Brennan (0-25) |
| Previous: | 1989 |
| Next: | 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 began on 6 June 1990 ended on 9 September 1990.
Tipperary entered the championship as the defending champions.
On 9 September 1990, Kilkenny won the championship after a 2-11 to 1-11 defeat of Tipperary in the All-Ireland final.[1] This was their fifth All-Ireland title overall and their first title since 1985.
Kilkenny's Jamesie Brennan was the championship's top scorer with 0-25.
First round
Semi-finals
Final
Quarter-final
Semi-finals
Final
Final
Semi-finals
Final
| Rank | Player | County | Tally | Total | Matches | Average | |
|---|---|---|---|---|---|---|---|
| 1 | Jamesie Brennan | Kilkenny | 0-25 | 25 | 5 | 5.00 | |
| 2 | Liam Sheedy | Tipperary | 0-24 | 24 | 4 | 6.00 | |
| 3 | D. J. Carey | Kilkenny | 4-07 | 19 | 5 | 3.80 | |
| 4 | Charlie Carter | Kilkenny | 3-09 | 18 | 5 | 3.60 | |
| 5 | Anthony Wall | Tipperary | 4-05 | 17 | 4 | 4.25 |