- Dec 2 37th Iron Bowl: Auburn beats Alabama 17-16 in Birmingham, Alabama
Ilie Năstase
Dec 2 Romanian tennis star Ilie Năstase successfully defends his ATP Masters Grand Prix title with a 6–3, 6–2, 3–6, 2–6, 6–3 win over American Stan Smith in Barcelona, Spain
- Dec 3 CFL Grey Cup, Ivor Wynne Stadium, Hamilton: Hamilton Tiger-Cats defeat Saskatchewan Roughriders, 13-10; Tiger-Cats first team in CFL's modern era to win Grey Cup at home
- Dec 5 38th Heisman Trophy Award: Johnny Rodgers, Nebraska (FL)
- Dec 11 New York Jets' Don Maynard becomes all time pro reception leader (632)
- Dec 16 Miami Dolphins become 1st undefeated NFL team (14-0-0)
- Dec 23 "Immaculate Reception" Steelers turns around a 7-6 defeat with a last second touchdown reception against Raiders to win 13-7 [1]
- Dec 23 2nd Fiesta Bowl: #15 Arizona State beats Missouri, 49-35
- Dec 23 New York Islanders end 15 games winless streak
Franz Beckenbauer Gets Award
Dec 26 Ballon d'Or: Bayern Munich defender Franz Beckenbauer wins award for best European football player ahead of tied fellow German duo of Gerd Müller and Günter Netzer
Court Defeats Goolagong
Dec 31 Australian Open Women's Tennis: Margaret Court beats Evonne Goolagong Cawley 6-4, 7-5 for her record 11th and final Australian singles crown
- Dec 31 NFC Championship, RFK Stadium, Washington, D.C.: Washington Redskins beat Dallas Cowboys 26-3