2018 Leinster Senior Hurling Championship

The 2018 Leinster Senior Hurling Championship is the 2018 installment of the annual Leinster Senior Hurling Championship organised by Leinster GAA.

This was the first year of a new format.

Galway won a second consecutive title and third ever by defeating Kilkenny in the final.

Format
A new provincial hurling championship featuring five-team round-robin groups in both Leinster and Munster and the new Joe McDonagh Cup was introduced in 2018 for an initial three-year period. The proposal was carried by a narrow margin with 62% voting in favour (a majority of at least 60% was required) at the GAA's Special Congress on 30 September 2017. The top two teams in each provincial group would contest the provincial final, with the provincial winners advancing to the All-Ireland semi-finals and the losing provincial finalists advancing to the two quarter-finals.

An amendment to the motion from Laois, Offaly and Meath was carried by 87%. The third-placed teams in Leinster and Munster would compete in All-Ireland preliminary quarter-finals against the two Joe McDonagh Cup finalists, with the Joe McDonagh Cup teams having home advantage.

If a non-Munster team were to win the Joe McDonagh Cup, the bottom team in the Leinster championship would be relegated to the following year's Joe McDonagh Cup and would be replaced in the following year's Leinster championship by the Joe McDonagh Cup winners. If a Munster team were to win the Joe McDonagh Cup, they would play off against the team who finished bottom in the Munster championship for the right to play in the following year's Munster championship, thereby ensuring that only Munster teams compete in the Munster championship.

The restructure of hurling involved the reduction of the Leinster championship from nine teams to five while the Munster championship continued with the previous five Munster teams (Kerry previously competed in the qualifier group of the Leinster championship). A six-team Joe McDonagh Cup was created, consisting of all four teams from the 2017 Leinster qualifier group plus Antrim and Carlow, the 2017 Christy Ring Cup finalists.

Teams
The Leinster championship was contested by four counties from the Irish province of Leinster, as well as one county from the Irish province of Connacht, where the sport is only capable of supporting one county team at this level.

Group table

 * {| class="wikitable" style="text-align:center"

!width=20|Pos !width=150 style="text-align:left;"|Team !width=20|Pld !width=20|W !width=20|D !width=20|L !width=30|SF !width=30|SA !width=20|Diff !width=20|Pts
 * - style="background:#ccffcc"
 * 1||align=left|Colours of Galway.svg Galway ||4||4||0||0||7-89 (110)||6-62 (80)||+30||8
 * - style="background:#ccffcc"
 * 2||align=left|Colours of Kilkenny.svg Kilkenny ||4||3||0||1||5-76 (91)||6-69 (87)||+4||6
 * - style="background:#FFFFE0"
 * 3||align=left|Colours of Wexford.svg Wexford ||4||2||0||2||6-81 (99)||5-68 (83)||+16||4
 * 4||align=left|Colours of Dublin.svg Dublin ||4||1||0||3||9-73 (100) ||1-85 (88)||+12||2
 * - style="background:#ffcccc"
 * 5||align=left|Colours of Offaly.svg Offaly ||4||0||0||4||5-50 (65)||14-85 (127)||–62||0
 * -|align=left|
 * colspan="10" style="border:0px"| Green background The top two teams contested the Leinster Final, with the winners advancing to the All-Ireland semi-finals and the losers advancing to the All-Ireland quarter-finals. Yellow background The third-placed team advanced to the All-Ireland preliminary quarter-finals. Red background As the 2018 Joe McDonagh Cup was won by Carlow (a Leinster county), the bottom team in the Leinster group, Offaly, were relegated to the 2019 Joe McDonagh Cup.
 * }
 * }

Final
The winning team advanced to the All-Ireland SHC semi-finals, while the losing advanced to the All-Ireland SHC quarter-finals.