The Franco-Prussian War or Franco-German War, often referred to in France as the War of 1870, was a conflict between the Second French Empire and the North German Confederation led by the Kingdom of Prussia.

The causes of the Franco-Prussian War are deeply rooted in the events surrounding German unification.

This is an order of battle of the French and German Armies at the beginning of the Franco-Prussian War in 1870.

Belgium was not a belligerent in the Franco-Prussian War, as the country was neutral throughout the war, but was heavily influenced by the social and political effects of the conflict.