The All-Ireland Senior Hurling Championship 1921 was the 35th series of the All-Ireland Senior Hurling Championship, Ireland's premier hurling knock-out competition.
Limerick won the championship, beating Dublin 8-5 to 3-2 in the final.
[1] All-Ireland Championship Semi-final: (1 match) This was a lone match which saw the winners of the Munster championship play Galway who received a bye to this stage.
Final: (1 match) The winners of the lone semi-final played the winners of the Leinster championship.
The winners were declared All-Ireland champions.