1919 in sports describes the year's events in world sport. Although World War I had ended in 1918, the influenza pandemic and planning difficulties from the war still curtailed sport to a considerable extent.
Leeds City is expelled from the Football League due to financial irregularities after the 1919–20 season has begun; Port Vale is elected as a late entrant and takes over Leeds City's playing record to date.
Even before game one of this World Series, there are rumours that some White Sox players have agreed to throw the series to the Reds for payment from gamblers. This will explode a year later in the Black Sox Scandal.
4 July — Jack Dempsey becomes World Heavyweight Champion by knocking out Jess Willard, the defending champion, in four rounds. Dempsey becomes one of the greatest-ever boxing champions, his charisma and punching power enabling promoters to stage the first "million dollar gates".
Very few first-class matches are played worldwide during the 1918–19 season but the County Championship is reintroduced in the 1919 English season to progress the game's post-war recovery.
18 October – With the end of World War I, first-class cricket is played in South Africa for the first time since 13 April 1914. However, the interprovincial Currie Cup does not resume until 1920–21.
