The 1920 All-Ireland Senior Football Championship was the 34th staging of Ireland's premier Gaelic football knock-out competition. The championship was disrupted by the ongoing Irish War of Independence, including the events of Bloody Sunday in November 1920, when British forces killed fourteen people at a match between Dublin and Tipperary at Croke Park in Dublin. Because Dublin and Tipperary were the eventual finalists, it is often incorrectly assumed that this was the All-Ireland final, but it was actually a challenge match held to raise funds for the Republican Prisoners Dependents Fund. In fact, Tipperary did not play their semi-final match until 1922, 19 months after Dublin won the first semi-final.