The Leinster Under-21 Hurling Championship, currently known for sponsorship reasons as the Erin Leinster Under-21 Hurling Championship, is an U-21 inter-county hurling tournament in the province of Leinster, in Ireland. The first tournament took place in 1964 when Wexford were crowned champions. Wexford defeated Laois by a scoreline of 4-07 to 2-02 in the 1964 final. Dublin are the current champions and have won the tournament 4 times.
The winning trophy is called the Robbins Cup and is named after Seán Robbins (Offaly) - Chairman of the Leinster Council (1936–1938).
The 2011 final was contested by Dublin and Wexford and Dublin won by 1-18 to 0-11.