Britain Prepared (1915) is a British documentary feature film. The film is silent and made in black-and-white with some colour sequences in the Kinemacolor additive color process.

The film documents Britain's military preparedness, showing scenes of the army and navy in preparation for war, and the manufacture of munitions. The film was made by the Cinema Committee, comprising Charles Urban, William Jury of Jury's Imperial Pictures and Tommy Welsh of Gaumont, at the behest of the covert British propaganda organisation, the War Propaganda Bureau (also known as Wellington House). It was the first major British official film of World War I.