- Apr 1 "SOS" first adopted as a morse distress signal (· · · – – – · · ·) by German government
- Apr 1 British East African Protectorate becomes colony of Kenya
- Apr 2 Cairo-Capetown railway opens
- Apr 4 Earthquake in Kangra India, kills 20,000
- Apr 5 J.m.Barrie's stage play "Alice Sit-by-the-Fire" premieres in London
- Apr 6 Germany receives invitation from Sultan of Morocco to an international conference to discuss matters relating to Morocco
- Apr 12 French Dufaux brothers test helicopter
- Apr 12 Hippodrome arena opens (NYC)
- Apr 17 9th Boston Marathon won by Fred Lorz in 2:38:25.4
- Apr 17 US Supreme Court judges maximum work day unconstitutional in Lochner v. New York by declaring the "right to free contract" implicit in the due process clause of the 14th Amendment of the Constitution
- Apr 21 The elective assembly of Crete proclaims union with Greece
- Apr 22 Operations begin uniting conservatory of Nature monument Amsterdam
Jack Hobbs Debut
Apr 24 First-class cricket debut of Sir Jack Hobbs, "The Master" for Surrey v the "Gentlemen of England" (18 & 88)
- Apr 24 Senators execute a triple-play & beat Yankees 4-3
- Apr 25 Latest day of 1st-class cricket in an Aust season (NSW v Qld)
- Apr 25 Whites win right to vote in South Africa
- Apr 26 Cubs Jack McCarthy becomes only major league player to throw out 3 runners at plate in 1 game, all were ends of a double play
- Apr 27 World Exposition opens in Liège
- Apr 29 2" rain falls in 10 mins in Taylor, Texas
Brazza Lands in Libreville
Apr 29 Pierre Savorgnan de Brazza lands in Libreville, Gabon
- Apr 30 First official soccer game between neighbouring countries Belgium-Netherlands; Dutch win, 4-1 at Olympic Stadium, Antwerp
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists