| All Ireland Champions | |
|---|---|
| Winners | Cork (1st win) |
| Captain | Gerald McCarthy |
| All Ireland Runners-up | |
| Runners-up | Wexford |
| Provincial Champions | |
| Munster | Cork |
| Leinster | Wexford |
| Ulster | Antrim |
| Connacht | Roscommon |
|
← 1965
1967 →
|
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The 1966 All-Ireland Under-21 Hurling Championship was the third staging of Ireland's hurling knock-out competition for players aged between 18 and 21. Cork won the championship, beating Wexford 9-9 to 5-9 after two replays in the final.
Semi-finals: (2 matches) The four provincial representatives contest these games. The pairings are Munster v Connacht and Leinster v Ulster. Two teams are eliminated at this stage while two teams advance to the All-Ireland final.
Final: (1 match) The winners of the two semi-finals contest the All-Ireland final.