The Ulster U-21 Hurling Championship, or for sponsorship reasons the Erin Ulster Under-21 Hurling Championship, is an Under 21 hurling tournament between counties affiliated to Ulster. The winners of the Ulster championship go on to qualify for the All-Ireland Under-21 Hurling Championship. The most successful county to date are Antrim who have won the competition on 36 occasions. The 2010 champions were Antrim who defeated Armagh by 0-21 to 0-16.. Antrim had won the 2009 title by beating Derry.In 2011, Antrim completed a three in a row of titles, beating Armagh.