- Dec 2 Josef Gruber, Austrian organist and composer, dies at 78
- Dec 3 Richard Henry Warren, American organist and composer, dies at 74
- Dec 4 Stefan George, German poet (Das neue Reich), dies at 65
- Dec 9 Morice Bird, cricketer (scored 280 runs in 10 Tests for England), dies
- Dec 11 Emile Wauters, Belgian painter (Van der Goes Klooster), dies at 87
- Dec 12 Theodore Moses Tobani, German composer, dies at 78
- Dec 17 Hans Vaihinger, German philosopher (Side-Studies), dies at 81
- Dec 17 Thubten Gyatso, 13th Dalai Lama, dies at 57
- Dec 19 George Jackson Churchward, GWR Chief mechanical engineer. (b. 1857)
- Dec 21 Knud J. V. Rasmussen, Danish Pole explorer (Thule), dies at 54
- Dec 25 Francesc Macià, Catalonian statesman (b. 1859)
- Dec 26 Anatoly Lunacharsky, Russian Marxist revolutionary, author and literary critic, dies at 58
- Dec 29 Joh Georghe Duca, premier of Romania, murdered