- 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 13 Battle of Oviumbo (in modern Namibia): Herero tribesmen rise up against German colonists
- Apr 13 US Congress authorizes Lewis & 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 18 L'Humanité, under Jean Jaurès begins publishing
- Apr 19 8th Boston Marathon won by Michael Spring of NY in 2:38:04.4
- Apr 19 Much of Toronto destroyed by fire
- Apr 20 Louisiana Purchase Exposition opens in St Louis
Event of Interest
- Apr 23 American Academy of Arts & Letters forms
- 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
- Apr 25 NY Highlander Jack Chesbro's 1st of 41 wins this year
- Apr 26 Bell Telephone Company of Antwerp Belgium forms
- Apr 26 John C Watson leads the first Labour Government of Australian when Alfred Deakin resigns
- Apr 26 General Kuroko leads the Japanese Army against the large Russian force at the Yalu river during the Russo-Japanese War
First Labour Government
Apr 27 The Australian Labor Party under Prime Minister Chris Watson becomes the first Labor government in the world
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- Apr 30 Ice cream cone makes its debut