| Leinster GAA Hurling Under-20 Championship | |
|---|---|
Current season or competition: 2024 All-Ireland Under-20 Hurling Championship | |
 | |
| Irish | Craobh Iomána Fé-20 Laighin |
| Code | Hurling |
| Founded | 1964 |
| Region | Leinster (GAA) |
| No. of teams | 8 |
| Title holders |  Offaly (7th title) |
| Most titles |  Kilkenny (27 titles) |
| Sponsors | oneills.com |
| TV partner(s) | TG4 |
| Official website | bgeu21 |
The Leinster GAA Under-20 Hurling Championship (known for sponsorship reasons as the oneills.com Leinster GAA Under-20 Hurling Championship), is an annual inter-county hurling competition organised by the Leinster Council of the Gaelic Athletic Association (GAA). It is the highest inter-county hurling competition for male players between the ages of 17 and 20 in the province of Leinster. The championship was contested as the Leinster Under-21 Championship between 1964 and 2018 before changing to an under-20 age category from 2019. It is sponsored by oneills.com.
The series of games are played during the summer months with the Leinster final currently being played in July. The prize for the winning team is the Seán Robbins Cup. The championship has always been played on a straight knock-out basis whereby once a team loses they are eliminated from the series.
The Leinster Championship is an integral part of the wider All-Ireland Under-20 Hurling Championship. The winners of the Leinster final, like their counterparts in the Munster Championship, advance directly to the All-Ireland Under-20 Hurling Championship final.
Eight teams currently participate in the Munster Championship. Kilkenny is the most successful team with 27 titles, followed by Wexford with 17 titles. The title has been won by six different teams, four of whom have won the title more than once.
Offaly are the current holders.