The Battle of Waterloo was fought on Sunday, 18 June 1815, near Waterloo in present-day Belgium, then part of the United Kingdom of the Netherlands. A French army under the command of Napoleon was defeated by the armies of the Seventh Coalition, comprising an Anglo-allied army under the command of the Duke of Wellington combined with a Prussian army under the command of Gebhard von Blücher.

The battlefield is located in Belgium, about 15 kilometres (9.3 mi) south of Brussels, and about 2 kilometres (1.2 mi) from the town of Waterloo. The site of the battlefield today is dominated by a large monument, the Lion's Mound. As this mound was constructed from earth taken from the battlefield itself, the contemporary topography of the battlefield near the mound has not been preserved.

The infamous battle of Waterloo wasn't fought at Waterloo. Napolean's defeat occurred outside the village of Pancenoit, which was over four miles away. Most likely it changed to Waterloo because it was easier to pronounce.