- Oct 1 Abdur Rahman Khan, Emir of Afghanistan (1880-1901)
- Oct 2 Rudolph Koenig, German physicist, dies at 68
- Oct 10 Lorenzo Snow, 5th president of The Church of Jesus Christ of Latter-day Saints (LDS), dies at 87
- Oct 19 Carl Frederik Tietgen, Danish financier and industrialist (b. 1829)
- Oct 21 James A. Walker, Brigadier General (Confederate Army), dies at 69
- Oct 23 Georg von Siemens, founder (Deutsche Bank), dies
- Oct 24 Paul Henrion, French composer, dies at 82
- Oct 29 Leon Czolcosz, assassin of President McKinley, is electrocuted
- Oct 30 ... Opperman, South African Boer general (Spy), killed in battle
- Oct 30 U Benson, British lt-col (Magers' fountain), killed in battle