- Mar 4 James Forten, African-American abolitionist and businessman who used his wealth to push for civil rights and the abolition of slavery, dies at 75
- Mar 6 Constanze Mozart, wife of W.A. Mozart (b. 1763)
- Mar 7 Christian Theodor Weinlig, German composer, dies at 61
- Mar 13 Henry Shrapnel, English Army officer and inventor (created the shrapnel shell), dies at 80
- Mar 15 Luigi Cherubini, Italian musical prodigy, composer (Médée; Requiem in D minor), and educator (Conservatoire de Paris, 1822-42), dies at 81
- Mar 23 Stendhal [Marie-Henri Beyle], French author (Le Rouge et de Noir, a Chartreuse de Parme), dies at 59
- Mar 30 Elisabeth Vigee-Lebrun, French painter (b. 1755)
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning