Battle Studies is a book by Ardant du Picq, a French colonel, on the cohesion and behaviour of soldiers in battle. The work was never completed, but Du Picq had written many chapters completely and left sufficient notes behind to complete the book. He argued that the central experience of battle was terror and that the core question of tactics was how to have soldier maintain their cohesion and organisation despite that terror.

The theme of the book, according to Marshal of France Ferdinand Foch, is that "moral force" is the most powerful element in the strength of armies and the preponderating influence in the outcome of battles. In general form, he states:

Combat is the object, the cause of being, and the supreme manifestation of an army. Every measure that does not keep combat as the object of the army is fatal. All the resources accumulated in time of peace, all the training, and all the strategic calculations must have the goal of combat.

Du Picq's work attempts to deal with the principles of warfare as an empirical study, based on case studies of battles.

Battle Studies became a key textbook in the French Army's École de Guerre in the years leading to World War I.