- Oct 5 Last day of Julian calendar in Alaska
- Oct 14 15th and last Tokugawa Shogun, Tokugawa Yoshinobu resigns in Japan
- Oct 16 Alaska adopts Gregorian calendar, crosses intl date line
- Oct 18 US takes formal possession of Alaska from Russia having paid $7.2 million
- Oct 22 Foundation of the National University of Colombia.
- Oct 23 72 Senators are summoned by Royal Proclamation to serve as the first members of the Canadian Senate.
Event of Interest
Oct 27 Giuseppe Garibaldi marches on Rome for the second time

Giuseppe Garibaldi