- 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 5th Boston Marathon won for second straight year by Canadian Jim Caffrey in race record 2:29:23.6
- Apr 15 Pope Leo XIII issues an allocution deploring hostile actions against the Roman Catholic Church throughout Europe
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 The Chicago White Stockings win against the Cleveland Blues in the 1st game played in baseball's American League
- 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