- Apr 11 New York Giants future Baseball Hall of Fame backstop Roger Bresnahan becomes first catcher to wear shin guards
- Apr 12 Belgium government of Paul Smet de Naeyer resigns
- Apr 12 In Switzerland, parliament passes a new army bill reorganizing the nation's forces into a standing militia, with training required for all males
- Apr 15 11th Boston Marathon won by Canadian Tom Longboat in race record 2:24:24
- Apr 17 Ellis Island, New York records 11,745 immigrants
- Apr 18 Augustus Thomas' "Witching Hour" premieres in NYC
- Apr 18 Fairmont Hotel opens in San Francisco
- Apr 26 Jamestown, Virginia Tercentenary Exposition opens
- Apr 30 Honolulu, Hawaii, becomes an independent city.
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists