The Valley campaigns of 1864 began as operations initiated by Union Lieutenant General Ulysses S. Grant and resulting battles that took place in the Shenandoah Valley of Virginia during the American Civil War from May to October 1864. Some military historians divide this period into three separate campaigns. This article considers them together, as the campaigns interacted and built upon one another.

The Shenandoah Valley is a geographic valley and cultural region of western Virginia and the Eastern Panhandle of West Virginia in the United States. The Valley is bounded to the east by the Blue Ridge Mountains, to the west by the eastern front of the Ridge-and-Valley Appalachians, to the north by the Potomac River, to the south by the James River, and to the Southwest by the New River Valley. The cultural region covers a larger area that includes all of the Valley plus the Virginia Highlands to the west and the Roanoke Valley to the south. It is physiographically located within the Ridge and Valley Province and is a portion of the Great Appalachian Valley.