| Type: | Under-21 |
| Year: | 1990 |
| Dates: | 12 June 1991 – 8 September 1991 |
| Teams: | 17 |
| Connacht: | Galway |
| Munster: | Tipperary |
| Leinster: | Offaly |
| Ulster: | Antrim |
| Team: | Galway |
| Titles: | 5th |
| Captain: | Brian Feeney |
| Team2: | Offaly |
| Captain2: | Johnny Pilkington |
| Topscorer: | Frankie Carroll (1-38) |
| Previous: | 1990 |
| Next: | 1992 |
The 1991 All-Ireland Under-21 Hurling Championship was the 28th staging of the All-Ireland Under-21 Hurling Championship since its establishment by the Gaelic Athletic Association in 1964. The championship began on 12 June 1991 and ended on 8 September 1991.
Kilkenny entered the championship as the defending champions, however, they were beaten by Offaly in the Leinster final.
On 8 September 1991, Galway won the championship following a 2-17 to 1-09 defeat of Offaly in the All-Ireland final.[1] This was their fifth All-Ireland title overall and their first title since 1986.
Limerick's Frankie Carroll was the championship's top scorer with 1-38.
Quarter-finals
Semi-finals
Final
Quarter-finals
Semi-finals
Final
Semi-finals
Final
Semi-finals
Final
| Rank | Player | County | Tally | Total | Matches | Average | |
|---|---|---|---|---|---|---|---|
| 1 | Frankie Carroll | Limerick | 1-38 | 41 | 5 | 8.20 | |
| 2 | Johnny Dooley | Offaly | 2-21 | 27 | 6 | 4.50 | |
| 3 | Brian Cunningham | Cork | 1-20 | 23 | 3 | 7.66 | |
| 4 | John Carson | Antrim | 2-16 | 22 | 3 | 7.33 | |
| Ken Ralph | Tipperary | 2-16 | 22 | 3 | 7.33 | ||
| 5 | John Brady | Offaly | 5-06 | 21 | 6 | 3.50 |