1919–20 Irish League

The 1919–20 Irish League was the 26th edition of the Irish League, the highest level of league competition in Irish football. The league comprised eight teams and Belfast Celtic won the championship.

Summary
The league championship resumed after a four-year suspension due to the First World War; during the war teams had competed locally in the Belfast & District League (between 1915–16 and 1918–19) or the Leinster Senior League.

Due to the political upheaval resulting from the Irish War of Independence, Belfast Celtic, Shelbourne and Bohemians all withdrew from the league with the conclusion of this season. Shelbourne and Bohemians later joined the new League of Ireland while Belfast Celtic would return to the Irish League in 1924-25.