The Battle of Berby was fought on 12 September 1808, between Swedish and Norwegian forces, during the Dano-Swedish War of 1808–09. Ever since the Battle of Prestebakke, the western front had been relatively calm, until colonel Posse launched a reconnaissance towards the Norwegian positions around at Berby, under Andreas Samuel Krebs; the Swedes pushed the Norwegians in front of them, all the way to Berby itself, where the Norwegians made a sturdy hold. At that time, Posse requested a ceasefire, as his reconnaissance had essentially evolved into a larger encounter; krebs accepted and after half an hour, the Swedes went back across the border. The battle was the last significant engagement between Swedish and Norwegian forces, that year.

The Dano–Swedish War of 1808–1809 was a war between Denmark–Norway and Sweden due to Denmark–Norway's alliance with France and Sweden's alliance with the United Kingdom during the Napoleonic Wars. Neither Sweden nor Denmark-Norway had wanted war to begin with but once pushed into it through their respective alliances, Sweden made a bid to acquire Norway by way of invasion while Denmark-Norway made ill-fated attempts to reconquer territories lost to Sweden in the 17th century. Peace was concluded on grounds of status quo ante bellum on 10 December 1809.