- Oct 13 Battle of Queenstown Heights: British forces defeat United States forces attempting to invade Canada
- Oct 14 Work on London's Regent's Canal starts.
- Oct 22 Duke of Wellington seizes Burgos, Spain
- Oct 23 Failed coup against French Emperor Napoleon Bonaparte
- Oct 24 Napoleonic Wars: The Battle of Maloyaroslavets takes place near Moscow, French army then forced to retreat through the snow towards Smolensk
- Oct 25 US frigate United States captures British vessel Macedonian