The Battle of Bomarsund, in August 1854, took place during the Åland War, which was part of the Crimean War, when an Anglo-French expeditionary force attacked a Russian fortress. It was the only major action of the war to take place at Bomarsund in the Baltic Sea.

The Åland War was the operations of a British-French naval force against military and civilian facilities on the coast of the Grand Duchy of Finland in 1854–1856, during the Crimean War between the Russian Empire and the allied France and Britain. The war is named after the Battle of Bomarsund in Åland. Although the name of the war refers to Åland, skirmishes were also fought in other coastal towns of Finland in the Gulf of Bothnia and the Gulf of Finland.