- Mar 2 Fidél Pálffy, Hungarian National socialist (leading supporter of Nazism in Hungary), dies at 50
- Mar 2 George E. Stewart, American army officer and Medal of Honor recipient, dies at 73
- Mar 4 Bror von Blixen-Finecke, Danish big-game hunter (b. 1886)
- Mar 8 Frederick Lanchester, English Engineer who built the first British petrol automobile (1896), dies at 77
- Mar 12 Philip Merivale, British actor (Mr. & Mrs. Smith, Nothing But Trouble), dies from a heart ailment at 59
- Mar 13 Abraham Bredius, Dutch art historian (Rembrandt), dies at 90
- Mar 13 Karl Haushofer, German soldier and geographer, dies at 76
- Mar 13 Thomas Frederick Dunhill, composer, dies at 69
- Mar 13 Werner von Blomberg, German politician and general (Commander-in-Chief German Armed Forces 1935-38), dies of cancer in detention at 67
- Mar 16 Max Blokzijl, Dutch radio presenter, executed for broadcasting Nazi propagandist during WWII, at 61
- Mar 17 Dai Li, Chinese spymaster (b. 1897)
- Mar 19 Amir Hamzah, Indonesian poet (Buah Rindu), dies killed by a communist extremists at 35
- Mar 22 Clemens August von Galen, German Catholic Bishop of Münster (led opposition to Nazism, especially T4 extermination program), dies at 68
- Mar 23 Gilbert N. Lewis, American Chemist (theory of covalent bonding), dies at 70
- Mar 24 Alexander Alekhine, Russian-French chess player (world champion 1927-35, 37-46), dies choking on meat at 53
- Mar 24 Gustaf Heintze, Swedish composer, dies at 66
- Mar 26 Alexandru Zirra, Romanian composer, dies at 62
- Mar 28 Cum Posey, American Baseball HOF executive (owner NgL Homestead Grays; 9 x consecutive NL pennants 1937–45); and Basketball HOF guard (5 x Coloured World C'ships), dies from cancer at 55
- Mar 30 John Vereker, British-Irish aristocrat (6th Viscount Gort), decorated military officer (WWI, WW2), and administrator (Governor of Malta, 1942-44; High Commissioner of British Mandate of Palestine, 1944-45), dies of liver cancerat 59
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning