1788 in sports

1788 in sports describes the year's events in world sport.

Boxing
Events
 * Tom Johnson retained his English championship but no fights involving him are recorded in 1788.
 * 31 December — "Big" Ben Brain defeated William Corbally at Navestock in 20 minutes.

Cricket
Events England
 * Marylebone Cricket Club (MCC) published its version of the Laws of cricket, revising the Star and Garter Laws of 1774
 * Most runs – Billy Beldham 381
 * Most wickets – David Harris 43

Horse racing
England
 * The Derby – Sir Thomas
 * The Oaks – Nightshade
 * St Leger Stakes – Young Flora