The Swedish–Norwegian War, also known as the Campaign against Norway, War with Sweden 1814, or the Norwegian War of Independence, was a war fought between Sweden and Norway in the summer of 1814. According to the Treaty of Kiel, Norway would enter a union with Sweden under Charles XIII of Sweden. The war resulted in Norway being forced into the United Kingdoms of Sweden and Norway, but with its own constitution and parliament. The war marked the last time Sweden participated in an armed conflict with another nation, and its conclusion signalled the beginning of the country's long period of military neutrality.

In the War of the Sixth Coalition, sometimes known in Germany as the Wars of Liberation, a coalition of Austria, Prussia, Russia, Spain, Great Britain, Portugal, Sweden, Sardinia, and a number of German States defeated France and drove Napoleon into exile on Elba. After the disastrous French invasion of Russia of 1812 in which they had been forced to support France, Prussia and Austria joined Russia, the United Kingdom, Sweden, and Portugal, and the rebels in Spain who were already at war with France.