- Dec 1 After just 3 seasons in MLB the Houston Colt .45s change name of the team to Astros; owners say move signals a step into the future for the franchise and the city of Houston
- Dec 4 Baseball approves a free-agent draft
- Dec 4 Commissioner's office given full powers in baseball disputes
- Dec 4 Test Cricket debut of Ian Chappell, v Pakistan MCG, 11, 0-49, 0-31
- Dec 12 Cleveland Browns' Frank Ryan sets club record of 5 TD passes
Award to Denis Law
Dec 22 Ballon d'Or: Manchester United striker Denis Law wins award for best European football player; beats Inter midfielder Luis Suárez and Real Madrid winger Amancio Amaro; first Scotsman to win the award
- Dec 26 AFL Championship, War Memorial Stadium, Buffalo: Buffalo Bills beat San Diego Chargers 20-7; defending champions can't overcome 1st quarter injury to star RB Keith Lincoln
- Dec 27 National Football League Championship, Cleveland Stadium: Cleveland Browns shutout Baltimore Colts, 27-0; last championship win by a major-league pro sports team from Cleveland until 2016 NBA Cavaliers
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