1803 in sports

1803 in sports describes the year's events in world sport.

Boxing
Events
 * English champion Jem Belcher loses an eye following an injury sustained in a fives match. He retires from boxing but returns later.

Cricket
Events England
 * Thomas Howard makes his debut in first-class cricket.
 * Most runs – Lord Frederick Beauclerk 284 (HS 74)
 * Most wickets – Lord Frederick Beauclerk 12

Horse racing
England
 * The Derby – Ditto
 * The Oaks – Theophania
 * St Leger Stakes – Remembrancer