1966 All-Ireland Under-21 Hurling Championship
The 1966 All-Ireland Under-21 Hurling Championship was the third staging of the All-Ireland Under-21 Championship since its establishment by the Gaelic Athletic Association in [1964 All-Ireland Senior Hurling Championship|All-Ireland Under-21 Hurling Championship|1964]. The championship began on 27 March 1966 and ended on 3 November 1966
Wexford entered the championship as the defending champions.
The All-Ireland final, the only one to have gone to two replays, was eventually decided on 3 November 1966 at Croke Park in Dublin, between Cork and Wexford, in what was their first ever championship meeting. Cork won the match by 9-09 to 5-09 to claim their first championship title.
Cork's Charlie McCarthy and Seánie Barry were the championship's top scorers.
Results
[Leinster Under-21 Hurling Championship]
First roundQuarter-finals
Semi-finals
'''Final'''
[Munster Under-21 Hurling Championship]
Quarter-finalsSemi-finals
'''Final'''
[All-Ireland Under-21 Hurling Championship]
Semi-finals'''Finals'''
Championship statistics
Top scorers
;Top scorer overall| Rank | Player | Team | Tally | Total |
| 1 | Charlie McCarthy | Cork | 9-15 | 42 |
| 1 | Seánie Barry | Cork | 5-27 | 42 |
| 3 | Eddie Cousins | Wexford | 8-06 | 30 |
| 4 | Justin McCarthy | Cork | 4-17 | 29 |
| 5 | Andrew O'Flynn | Cork | 9-00 | 27 |
| 5 | Eddie O'Brien | Cork | 7-06 | 27 |
Miscellaneous
- Wexford beat Laois to win their third Leinster title in succession.
- Following the first All-Ireland final between Cork and Wexford, referee Donie Nealon had to be escorted from the pitch after dismissing two players, one from each team.
- The All-Ireland final went to a replay for the first time ever. It was also the only occasion that a final went to two replays.
- Cork's All-Ireland victory came a month after their All-Ireland success at senior level. Gerald McCarthy was the captain for both teams.