- Oct 1 Wilhelm Dilthey, German philosopher (Das Leben Schleiermans), dies at 77
- Oct 5 Charles Malherbe, French violinist and composer, dies at 58
- Oct 7 John Hughlings Jackson, English neurologist (b. 1835)
- Oct 14 John Marshall Harlan, U.S. Supreme Court Justice (b. 1833)
- Oct 18 Alfred Binet, French child psychologist who invented the first practical IQ test (Binet–Simon test), dies at 54
- Oct 29 Joseph Pulitzer, Hungarian publisher (St Louis Post-Dispatch, NY World), dies at 64