- Mar 2 Fred Merkle, American baseball figure (b. 1888)
- Mar 3 Willem Hendrik Keesom, Dutch physicist (Helium I/II), dies at 79
- Mar 5 Erich Itor Kahn, German composer of Jewish descent, dies at 50
- Mar 11 Sergey Nikiforovich Vasilenko, Russian opera composer, dies at 83
- Mar 16 Joseph John Richards, American composer, dies at 77
- Mar 17 Fred Allen, comedian (Fred Allen Radio Show), dies at 61
Irene Joliot-Curie
Mar 17 Irene Joliot-Curie, French physicist (Nobel laureate 1935) and daughter of Marie Curie, dies at 58
Irene Joliot-Curie
- Mar 18 Friedrich Panzer, German germanist (Hilde-Gudrun), dies at 85
- Mar 18 Louis Bromfield, writer, dies at 59
- Mar 20 Wilhelm Miklas, Austrian politician and 3rd President of Austria (1928-38), dies at 83
- Mar 22 George A L Sarton, Belgian/US historian, dies at 71
- Mar 24 Edmund Taylor Whittaker, British mathematician (applied mathematics and the theory of special functions), dies at 82
- Mar 25 George Luther Foote, composer, dies at 70
- Mar 25 Robert Newton, British actor (Treasure Island, Henry V, Around the World in 80 Days), dies from a heart attack at 50
- Mar 26 Thomas de Hartmann, Russian composer, dies at 70
- Mar 27 Frans Beelaerts van Blokland, minister of Foreign affairs, dies at 84
- Mar 29 Infante Alfonso of Spain (b. 1941)
- Mar 31 Ralph DePalma, Italian-American race car driver (b. 1884)