- Dec 1 NHL drops 20 minute slashing-about-the-head penalty
- Dec 3 Airborn chemicals combine with fog to kill 60 (Meuse Valley, Belgium)
- Dec 3 Otto Ender forms Austrian government
Music Premiere
Dec 3 Richard Rodgers and Lorenz Hart's musical "Evergreen" premieres in London
Richard Rodgers
- Dec 4 Vatican approves rhythm method for birth control
- Dec 6 CFL Grey Cup, Varsity Stadium, Toronto: Toronto Balmy Beach win their 2nd and final title; defeat Regina Roughriders, 11-6
- Dec 7 PGA Championship Men's Golf, Fresh Meadows CC: American based Scotsman Tommy Armour defeats Gene Sarazen 1 up in the final for the 2nd of his 3 major titles
- Dec 8 Broadway Theater opens at 1681 Broadway NYC
Music Premiere
Dec 8 Cole Porter's musical "NYCers" premieres in NYC
Cole Porter
- Dec 10 Indian Chandrasekhara Venkata Raman is presented with the Nobel Prize for Physics for work on light scattering - first Asian and non-white to win a Science Nobel
Nobel Prize
Dec 10 German chemist Hans Fischer is awarded the Nobel Prize for Chemistry for his work on haemin
Hans Fischer
- Dec 11 Bank of the United States closes in New York City
- Dec 12 Baseball Rules Committee greatly revises the rule book, ball bouncing into stands not a HR, now a double
- Dec 12 Start of the 1st Australia v West Indies Test (at Adelaide)
- Dec 13 French government of André Tardieu falls for the second time
- Dec 13 George Sisler's career ends when Boston Braves release him
- Dec 13 Theodore Steeg forms French government
- Dec 14 NY Giants defeat Notre Dame 22-0 in a charity game
- Dec 14 National Football League Championship: Green Bay Packers (10-3-1) repeat with best record in first past the post title
Event of Interest
Dec 15 Occasional leg-spin bowler Don Bradman takes his 1st of only 2 Test cricket wickets when he traps West Indian batsman Ivan Barrow lbw for 27 in the 1st Test in Adelaide
Donald Bradman
Event of Interest
Dec 16 Golfer Bobby Jones is the first to win the James E. Sullivan Award (best US amateur athlete)
Bobby Jones
Event of Interest
Dec 19 James Weldon Johnson resigns as executive secretary of NAACP
James Weldon Johnson
Contract of Interest
Dec 23 Bette Davis arrives in Hollywood under contract to Universal Studios
Bette Davis
- Dec 23 Police Bureau of Criminal Alien Investigation started in NYC
- Dec 24 F Garcia Lorca's "La Zapatera Prodigiosa" premieres in Madrid
- Dec 25 Mt Van Hoevenberg bobsled run at Lake Placid, NY opens, 1st US bobsled run open to public
- Dec 25 Slinger Nitschke scores 142 SA v Qld at Adelaide before 5,422
- Dec 25 Tasmania all out 280, WI 2-139 at Hobart Crowd 2,500
- Dec 29 Fred P. Newton completes longest swim ever (1826 miles), when he swam in the Mississippi River from Ford Dam, Minnesota, to New Orleans
- Dec 31 Pontifical encyclical Casti connubii against mixed marriages
- Dec 31 US tobacco industry produced 123 billion cigarettes in 1930