Official Records of the Union and Confederate Armies

This article is about the U.S. Government documents pertaining to land warfare during the American Civil War (1861–1865). For naval warfare, see Official Records of the Union and Confederate Navies.

The Official Records of the Union and Confederate Armies in the War of the Rebellion, commonly known as the Official Records of the Union and Confederate Armies or Official Records (OR or ORs), is the most extensive collection of American Civil War land warfare records available to the general public. It includes selected first-hand accounts, orders, reports, maps, diagrams, and correspondence drawn from official records of both Union and Confederate armies.