- Dec 3 Claude Ruel resigns as coach of the NHL Montreal Canadiens; replacement Al MacNeil leads Habs to a Stanley Cup championship 5 months later
- Dec 5 NFL Los Angeles Rams running back Willie Ellison sets NFL record of 247 yards rushing
- Dec 5 Stanley Cup, Conn Smythe Trophy & Bill Masterson Trophy stolen from Hockey Hall of Fame
Chappell's Debut Century
Dec 13 Greg Chappell scores 108 on Test debut v England at the WACA
Smith Wins Inaugural Season
Dec 15 Stan Smith and Rod Laver finish with 4-1 records atop inaugural season ending ATP Masters Grand Prix tennis standings in Tokyo, Japan; Smith wins event after beating Laver 4–6, 6–3, 6–4 in the rounds
Award to Gerd Müller
Dec 29 Ballon d'Or: Bayern Munich striker Gerd Müller wins award for best European football player ahead of West Ham United defender Bobby Moore and Cagliari forward Luigi Riva
- Dec 31 Would have been start of Aust/Eng Test Cricket at MCG, washed out
Baseball Players
Basketball Stars
Boxers
Footballers
NFL Stars
Tennis Champions