- Dec 1 Aleister Crowley, British occultist, founded the religion of Thelema, dies at 72
- Dec 1 G. H. Hardy, English mathematician (Hardy–Weinberg principle, A Mathematician's Apology), dies at 70
- Dec 7 Nicholas Murray Butler, American philosopher, diplomat (Nobel Peace Prize 1931), educator (Columbia University President), dies at 85
- Dec 7 Tristan Bernard, French playwright and novelist (b. 1866)
- Dec 13 Nicholas Roerich, Russian painter, dies at 73
- Dec 14 Franz Zorell, German RC lexicographer, dies at 84
Stanley Baldwin
Dec 14 Stanley Baldwin, British Prime Minister (Conservative: 1923-24, 1924-29, 1935-37), dies at 80
Stanley Baldwin
- Dec 14 Edward Higgins, General of The Salvation Army (b. 1864)
- Dec 15 Arthur Machen, Welsh author (b. 1863)
- Dec 22 Therese Brandl, Nazi concentration camp guard (b. 1902)
- Dec 25 Gaspar G. Bacon, was Lieutenant Governor of Massachusetts (b. 1886)
- Dec 28 Victor Emmanuel III, King of Italy (1900-46), dies at 78
- Dec 29 Joseph Cuvelier, Belgian historian/general, dies at 78
- Dec 30 Han [Henricus A] van Meegeren, Dutch painter/art forger, dies at 58
- Dec 31 Franz X Ritter von Epp, German General (SW Africa), dies at 79