Brigade, a military unit larger than a regiment and smaller than a division. It is the normal command of a brigadier general in the U.S. Army and Marine Corps, and of a brigadier in the British army. In the U.S. Army, a brigade usually consists of two or three battalions, sometimes more. The British army normally has three or four battalions to a brigade.

Gustavus Adolphus of 17th-century Sweden generally has been credited with originating the brigade. In the United States from the Revolutionary War through World War I, a brigade consisted of two or more regiments. In 1939 the U.S. Army was reorganized and the brigade was eliminated as a tactical unit. A 1962 reorganization reestablished the brigade, but it consisted of battalions rather than regiments.