- Oct 1 John Blow, English baroque composer (Venus & Adonis), dies at 59
- Oct 7 Guru Gobind Singh, Tenth Guru of Sikhism, founder and General of Khalsa Army, social reformist and poet, dies following an assassination attempt at 41
- Oct 10 David Gregory, Scottish astronomer (b. 1659)
- Oct 11 Ehrenfried Walther von Tschirnhaus, German mathematician (Tschirnhaus transformation), dies at 57
- Oct 13 Henry van Nassau, mister of Ouwerkerk/fieldmarshal, dies at 67
- Oct 18 Henry Van Nassau, stable master/fieldmarshal, dies at 67
- Oct 22 Herman Witsius [Wits], reformed theologist, dies at 72
- Oct 24 Kowa Seki, Japanese mathematician
- Oct 28 Prince George of Denmark, Prince Consort of Anne of England, dies at 55