- Apr 5 The first international rugby league match is played between England and an Other Nationalities team (Welsh & Scottish players) in Central Park, Wigan, England.
- Apr 8 Great Britain and France establish their Entente Cordiale, a technical treaty settling long-standing disagreements over Morocco, Egypt, Africa, and the Pacific
- Apr 8 British mystic Aleister Crowley transcribes the first chapter of the Book of the Law
- Apr 8 Entente Cordiale between Britain and France
- Apr 8 New York City changes the name of Longacre Square to Times Square, in honor of The New York Times’s move to the area
- Apr 13 Battle of Oviumbo (in modern Namibia): Herero tribesmen rise up against German colonists
Historic Event
Apr 13 US Congress authorizes Lewis and Clark Expo $1 gold coin
- Apr 13 A squadron of the Russian fleet is decoyed out of Port Arthur by Japanese maneuvers, when they realize they are sailing into a trap; their battleship Petropavlovsk hits a mine and sinks, with a loss of 700 men
- Apr 14 NY Highlanders' future Baseball HOF pitcher Jack Chesbro's first of 41 wins this season; pitches complete game and beats Boston Americans, 8-2 at Hilltop Park, NYC
- Apr 18 L'Humanité, under Jean Jaurès begins publishing
- Apr 18 8th Boston Marathon won by Michael Spring in 2:38:04.4
- Apr 19 Much of Toronto destroyed by fire
- Apr 20 Louisiana Purchase Exposition opens in St Louis
- Apr 23 American Academy of Arts & Letters forms
Historic Event
Apr 24 President Loubet of France visits King Victor Emmanuel III of Italy and pointedly ignores the Pope, exacerbating relations between France and the Roman Catholic Church
First Labour Government
Apr 27 The Australian Labor Party under Prime Minister Chris Watson becomes the first Labor government in the world
- Apr 30 Ice cream cone makes its debut at St. Louis World's Fair invented by Ernest A. Hamwi (independently of other claimant Italo Marchiony in NY)