1864 is a 2014 Danish television historical war drama series written and directed by Ole Bornedal. It is based on two books by Tom Buk-Swienty about the Second Schleswig War of 1864 between Denmark and an alliance of Prussia and Austria which ended in defeat for Denmark and the loss of a quarter of its territory to Prussia. It follows two brothers from a remote village on Funen who enlist in the Danish army just before the outbreak of war, and experience the horrors of combat in Schleswig. It also features actual historical figures such as Danish prime minister D. G. Monrad and Prussian prime minister Otto von Bismarck. It was the most expensive Danish TV series to be made to date.

The Second Schleswig War, also sometimes known as the Dano-Prussian War or Prusso-Danish War, was the second military conflict over the Schleswig-Holstein Question of the nineteenth century. The war began on 1 February 1864, when Prussian and Austrian forces crossed the border into the Danish fief Schleswig. Denmark fought troops of the Kingdom of Prussia and the Austrian Empire representing the German Confederation.