Wikipedia:Selected anniversaries/November 20
- 1739 – War of Jenkins' Ear: A British naval force arrived at the settlement of Portobello in the Spanish Main (now in Panama), which it would capture the next day.
- 1776 – American Revolutionary War: The Battle of Fort Lee saw the invasion of New Jersey by British and Hessian forces and the subsequent general retreat of the Continental Army.
- 1902 – While discussing how to promote the newspaper L'Auto, sports journalist Géo Lefèvre came up with the idea of holding a cycling race that later became known as the Tour de France.
- 1969 – A group of Native American activists began a 19-month occupation of Alcatraz Island (graffiti pictured) in San Francisco Bay.