1784 in sports

1784 in sports describes the year's events in world sport.

Boxing
Events
 * March — Tom Johnson defeated Croydon Drover in London after 27 minutes.
 * June — Tom Johnson defeated Stephen " Death " Oliver at Blackheath in a 35-minute fight. It's unknown if this was for the championship or not.

Cricket
Events England
 * First known appearance of a team representing the White Conduit Club, forerunner of Marylebone Cricket Club (MCC)
 * Most runs – James Aylward 55
 * Most wickets – William Bullen 8

Horse racing
England
 * The Derby – Serjeant
 * The Oaks – Stella
 * St Leger Stakes – Omphale