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.

The Grand Duchy of Finland, officially and also translated as the Grand Principality of Finland, was the predecessor state of modern Finland. It existed between 1809 and 1917 as an autonomous state ruled by the Russian Empire.