- Apr 5 Under threats from the Ottoman Turkish Government, Bulgaria is forced to arrest the leaders of the Macedonian Committee
- Apr 7 SDAP demands general voting right, abolishing First Chamber
- Apr 15 1st British motorized burial
- Apr 15 Pope Leo XIII issues an allocution deploring hostile actions against the Roman Catholic Church throughout Europe
- Apr 19 5th Boston Marathon won by Jim Caffrey of Canada in 2:29:23.6
Philippine Revolution
Apr 19 In the Philippines, recently captured insurgent leader Emilio Aguinaldo issues a proclamation advising his countrymen to end their rebellion and use of peaceful means to work with the US toward independence.
Emilio Aguinaldo
- Apr 24 1st AL game, Chicago beats Cleveland Blues 8-2, 3 other games rained out
- Apr 25 Erve Beck hits American League's 1st home run
- Apr 25 New York becomes 1st state requiring automobile license plates ($1 fee)
- Apr 25 In last of 9th, Detroit Tigers, trailing by 13-4, score 10 runs to win one of greatest comebacks in baseball (1st game in Detroit)
- Apr 26 Jimmy Collins, having left the Boston Beaneaters (NL), captains and manages his first game for the Boston Americans (against Baltimore)
- Apr 28 Cleveland's Bock Baker gives up a record 23 singles as White Sox beat Blues (Cleveland Blues!) 13-1
- Apr 29 27th Kentucky Derby: Jimmy Winkfield on His Eminence wins in 2:07.75
- Apr 29 Antisemitic riot in Budapest