- Dec 9 Jim Slight, cricketer (represented Australia at Oval 1880), dies
- Dec 9 Rube Foster, American Baseball HOF manager and executive (Negro National League pennant 1920–22, 26; Chicago American Giants), dies from insanity at 51
- Dec 11 Friedrich von Bernhardi, German general and military historian (Germany & the Next War), dies at 80
Clarence Kummer (1899-1930)
Dec 18 American Racing HOF jockey (Preakness Stakes 1920, 25; Belmont Stakes 1920, 28; US Champion Jockey by earnings 1920), dies from pneumonia at 31
- Dec 19 Johnny Douglas, English cricket all-rounder, captain (23 Tests, 1 x 100, 45 wickets; Essex CCC) and boxer (Olympic gold middleweight 1908), dies by drowning at 48
- Dec 23 Johannes H. Been, Brielle archivist, dies at 71
- Dec 24 Eduard David, German politician (constitution of Weimar), dies at 67
- Dec 24 Oskar Nedbal, Czech composer, dies at 56
- Dec 25 Harvey Worthington Loomis, American composer (Lyrics of the Red Man), dies at 65
- Dec 27 William Courtleigh, Canadian actor (The Birth of Character, Ashes, The Nightingale), dies at 63
Assassination
Drug Overdose
Gunshot Wound
Murder
Plane Crash
Suicide