1805 in sports

1805 in sports describes the year's events in world sport.

Boxing
Events
 * Hen Pearce wins the English championship after defeating Jem Belcher in 18 rounds at Doncaster.
 * 8 October — future English champion Tom Cribb narrowly defeats Afro-American Bill Richmond, who was born into slavery.

Cricket
Events England
 * Lord Frederick Beauclerk is the first batsman known to have scored two first-class centuries in the same season
 * Most runs – Lord Frederick Beauclerk 468 (HS 129*)
 * Most wickets – William Lambert 20

Horse racing
England
 * The Derby – Cardinal Beaufort
 * The Oaks – Meteora
 * St Leger Stakes – Staveley