- Mar 4 The Battle of Vinegar Hill, colony of New South Wales (Australia), when Irish convicts (some of whom had been involved in Ireland's Battle of Vinegar Hill in 1798) led the colony's only significant convict uprising.
- Mar 9 Georges Cadoudal, Breton royalist who plotted to overthrow Napoleon in the Pichegru Conspiracy, arrested
- Mar 17 Friedrich Schiller's play "Wilhelm Tell" premieres
- Mar 21 Napoleonic Code adopted in France, stresses clearly written and accessible law
- Mar 26 Congress orders removal of Indians east of Mississippi to Louisiana
- Mar 26 Territory of Orleans organizes in Louisiana Purchase
- Mar 28 Ohio passes law restricting movement of Blacks
- Mar 29 Thousands of Whites massacred in Haiti
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