- Apr 8 1945 NFL Draft: Charley Trippi from University of Georgia first pick by Chicago Cardinals
- Apr 9 NFL requires players to wear long stockings
- Apr 10 NFL's Boston Yanks & Brooklyn Tigers merge
- Apr 16 49th Boston Marathon won by John A Kelley in 2:30:40.2; his second event victory
- Apr 18 1 armed outfielder, St Louis Brown Pete Gray, 1st game he goes 1 for 4
- Apr 20 Cleveland Browns organization formed by Arthur "Mickey" McBride
- Apr 22 Stanley Cup Final, Olympia Stadium, Detroit, MI: Toronto Maple Leafs beat Detroit Red Wings, 2-1 for a 4-3 series win; Leafs lead series 3-0, but Wings recover to 3-3 to force a decider
- Apr 24 Albert B "Happy" Chandler is named 2nd baseball commissioner
- Apr 25 British troops reach the Grebbe Line, a forward defensive line in the Netherlands
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