- Mar 5 David Scott, Scottish painter (b. 1806)
- Mar 15 Giuseppe Caspar Mezzofanti, Italian cardinal and linguist (b. 1774)
- Mar 17 William II King of the Netherlands (1840-49), dies at 56
- Mar 27 Archibald Acheson, 2nd Earl of Gosford (b. 1776)
- Mar 28 Stephan L Endlicher, Austrian priest/botany, dies at 44