- Mar 2 Alexandre Yersin, Swiss French bacteriologist (discovered bubonic plague bacillus), dies at 79
- Mar 4 Nikolaos Politis, Greek foreign minister and diplomat (Greek representative League of Nations), dies at 71
- Mar 9 Oskar Hêks, Czech marathon runner and anti-fascist, murdered in the gas chamber of Auschwitz extermination camp at 35
- Mar 10 Lawrence Binyon, English poet (For the Fallen), dies at 73
- Mar 10 Otto Modersohn, German landscape painter (Worpswede artist colony), dies at 78
- Mar 10 Tully Marshall, American actor (Let's Go, Red Dust), dies at 78
- Mar 12 Gustav Vigeland, Norwegian sculptor, dies at 73
- Mar 13 J. P. Morgan, Jr. [John Pierpont Morgan, Jr], American financier and son of J.P. Morgan, Sr., (J.P. Morgan & Co.), dies of a stroke at 75
- Mar 13 Stephen Vincent Benét, American author (b. 1898)
- Mar 14 Pieter Cornelis Boutens, Dutch poet, classicist, and mystic (Voices, Carmina), dies at 73
- Mar 19 Frank Nitti [Francesco Nitto], Italian-American gangster, dies from self-inflicted gunshots at 57
- Mar 19 Vicente Ripollés, Spanish composer, dies at 75
- Mar 23 Andre Lichtenberger, French Sudan writer (Le Petit Roi), dies at 72
- Mar 23 Joseph Moiseyevich Schillinger, composer, dies at 47
- Mar 25 Marie Krogh, Danish physician (co-founder of Novo Nordisk), dies of breast cancer at 68
- Mar 26 Ben Lindsey, American judge and social reformer, dies at 73
- Mar 26 Lillien Jane Martin, American psychologist who founded the world's 1st gerontology clinic in San Francisco, dies at 91
- Mar 27 Grigori Yakovlevich Bakhchivangi, Russian test pilot (world speed record in BI-1 rocket plane), but killed in its crash at 35
Sergei Rachmaninoff (1873-1943)
Mar 28 Russian-American piano virtuoso, conductor, and composer (Aleko; Piano Concerto No. 3), dies at 69
- Mar 30 Jan Bytnar, Polish activist (b. 1921)
- Mar 30 Maciej Aleksy Dawidowski, Polish activist (b. 1920)
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning