- Apr 7 NFL adopts free substitution rule; helmets made mandatory and 10-game schedule for all teams approved
- Apr 8 1943 NFL Draft: Frank Sinkwich from University of Georgia first pick by Detroit Lions
- Apr 8 Stanley Cup Final, Boston Garden, Boston, MA: Detroit Red Wings beat Boston Bruins, 2-0 for a 4-0 series sweep and their 3rd SC Championship
- Apr 19 47th Boston Marathon won by Gerard Cote of Canada in 2:28:25.8; his 2nd of 4 wins in the event
Stengel Hit by Taxi
Apr 20 Braves manager Casey Stengel is struck by a taxi, fractures a leg
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