Williams to the Red Sox
Dec 7 Red Sox acquire the contract of 19-year-old Ted Williams
- Dec 7 Russian chess player Alexander Alekhine recaptures his final world title from Dutch grand master Max Euwe by a large margin (+10−4=11)
- Dec 11 25th CFL Grey Cup, Varsity Stadium, Toronto: Toronto Argonauts claim their 4th Championship; beat Winnipeg Blue Bombers, 4-3
- Dec 12 1938 NFL Draft: Corbett Davis from University of Indiana first pick by Cleveland Rams
- Dec 12 National Football League Championship, Wrigley Field, Chicago: Washington Redskins beat Chicago Bears, 28-21
- Dec 20 Australian cricket spin bowler Bill O'Reilly takes career best 9-41 for NSW in a Sheffield Shield match against South Australia at Adelaide Oval
- Dec 21 Australian cricket spin bowler Bill O'Reilly takes 5-57 to complete match figures of 14-98 as NSW beats South Australia by 33 runs in a Sheffield Shield match in Adelaide
- Dec 21 Chicago Black Hawks left wing Paul Thompson becomes first player in NHL history to score against his brother, Boston Bruins goaltender Cecil Thompson; scores with just 9 seconds left in regulation as Bruins win 2-1
- Dec 27 German immigration officials with no explanation bar Juan Carlos Zabala (Arg), 1932 Olympic marathon champion, from entering Germany
Baseball Players
Basketball Stars
Boxers
Footballers
NFL Stars
Tennis Champions