1979 December

1st  Padres OF Dave Winfield and Texas 3B Buddy Bell are first-time honorees as TSN announces the 1979 Gold Glove teams.

5th  A month after being acquired by the Blue Jays, Chris Chambliss goes to the Atlanta Braves with Luis Gomez for Barry Bonnell, Pat Rockett, and Joey McLaughlin. Chambliss will play 8 seasons for the Braves.

6thIn one of their better trades, the Royals acquire 1B Willie Aikins, Rance Mullinicks from the Angels for OF Al Cowens, Todd Cruz, and Craig Eaton. Aikens will have 4 solid years in KC, including two 2–homer games in the World Series.

7th  The Cardinals trade OF Jerry Mumphrey and P John Denny to the Indians for OF Bobby Bonds. The Tigers swap OF Ron LeFlore to the Expos for P Dan Schatzeder.

12th  The Giants sign reentry free agents 2B Rennie Stennett, C Milt May, and OF Jim Wohlford to contracts worth a total of $4.825 million.

31st  The Basic Agreement between players and owners expires, precipitating more than 19 months of bitter negotiations, culminating in the 1981 player strike.