- Apr 1 Stanley Cup Final, Seattle Ice Arena, Seattle, WA: With Montreal Canadiens (NHL) & Seattle Metropolitans (PCHA) tied at 2-2-1, trophy not awarded due to worldwide flu epidemic
- Apr 5 Antwerp is officially declared the host city for the Games of the 7th Olympiad to be conducted in 1920; first post WWI Olympics
- Apr 21 23rd Boston Marathon won by Carl Linder in 2:29:13.4