- Apr 4 Stanley Cup Final, Denman Arena, Vancouver, BC: Ottawa Senators (NHL) beat Vancouver Millionaires (PCHA), 2-1 for a 3-2 series victory
- Apr 11 KDKA in Pittsburgh, Pennsylvania broadcasts 1st radio sporting event, a boxing match between lightweights Johnny Ray and Johnny Dundee
- Apr 18 25th Boston Marathon won by Frank Zuna in race record 2:18:57.6
- Apr 23 Charles Paddock runs world record 100m (10.4 secs)
Capablanca World Chess Champion
Apr 28 Cuban José Raúl Capablanca becomes the world's third chess champion defeating German champion Emanuel Lasker in Havana
- Apr 30 1st American Professional Football Association Championship (1920): undefeated Akron Pros awarded inaugural title
- Apr 30 American Professional Football Association reorganizes in Akron, Ohio
Baseball Players
Basketball Stars
Boxers
Footballers
NFL Stars
Tennis Champions