- Dec 1 MLB announces attendance for the season is 20.2 million, down from 20.9 in 1948; New York Yankees and the Cleveland Indians each finish with over 2.2 million, but the St. Louis Browns fall to 270,000
- Dec 3 14th Iron Bowl: Auburn beats Alabama 14-13 in Birmingham
- Dec 4 Bob Gage ties NFL record of a 97 yard touchdown run
- Dec 7 15th Heisman Trophy Award: Leon Hart (end), Notre Dame
- Dec 9 NFL merges with AAFC; Cleveland Browns, San Francisco 49ers & Baltimore Colts join league intact, other teams in New York and Los Angeles are merged with existing units
- Dec 11 Chicago Bear Johnny Lujack passes for 6 touchdowns vs Chicago Cards (52-29)
- Dec 11 Cleveland Browns beat SF '49ers 21-7 in final AAFC championship game
- Dec 18 National Football League Championship, Philadelphia Eagles beat Los Angeles Rams, 14-0; played in driving rain that caused field to become a mud pit
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