- Oct 2 Louis Hersent, painter, dies
- Oct 3 Rembrandt Peale, American portrait and historical painter (Margaret Irvine Miller ,1805; Court of Death, 1820), and museum keeper (Baltimore), dies at 82
- Oct 6 Stephen Elvey, English composer, dies at 55
- Oct 12 Harry Smith, English military commander and leader of British-Indian forces (Battle of Aliwal), dies at 73
- Oct 24 Élie, Duke Decazes, French Bourbon Restoration politician (Sainte-Martin-de-Laye, France), dies at 80
- Oct 31 Johannes Nathan, Dutch murderer, the last ordinary execution in the Netherlands, hanged for killing his mother-in-law
- Oct 31 Thomas Cochrane, 10th Earl of Dundonald, British admiral, dies at 84