The 2021 All-Ireland Minor Hurling Championship was the 91st staging of the All-Ireland Minor Hurling Championship since its establishment by the Gaelic Athletic Association in 1928. The championship began on 30 June 2021 and ended on 21 August 2021. The 2021 championship was the first in over 90 years to begin before the previous year's championship had concluded. The number of participating teams also increased, with Down and Meath joining the Leinster Championship. Galway entered the championship as the defending champions in search of a fifth successive title.