Battle of Gettysburg Casualties: The two armies suffered between 46,000 and 51,000 casualties. Union casualties were 23,055 (3,155 killed, 14,531 wounded, 5,369 captured or missing), while Confederate casualties are more difficult to estimate. Many authors have referred to as many as 28,000 overall casualties, but Busey and Martin's more recent definitive 2005 work, Regimental Strengths and Losses, documents 23,231 (4,708 killed, 12,693 wounded, 5,830 captured or missing). Nearly a third of Lee's general officers were killed, wounded, or captured. The casualties for both sides during the entire campaign were 57,225. Bruce Catton wrote, "The town of Gettysburg looked as if some universal moving day had been interrupted by catastrophe." But there was only one documented civilian death during the battle: Ginnie Wade (also widely known as Jennie), 20 years old, was shot by a stray bullet that passed through her kitchen in town while she was making bread.

Nearly 8,000 had been killed outright; these bodies, lying in the hot summer sun, needed to be buried quickly. Over 3,000 horse carcasses were burned in a series of piles south of town; townsfolk became violently ill from the stench.

The following tables summarize casualties by corps for the Union and Confederate forces during the three day battle.

• Battle of Gettysburg
• Background and Movement - Battle of Gettysburg
• First Day Battle of Gettysburg
• Second Day Battle of Gettysburg
• Third Day Battle of Gettysburg
• Battle of Gettysburg Casualties
• Confederate Retreat from Gettysburg
• Battle of Gettysburg Effect on the Confederacy