List of battles with most United States military fatalities

This article contains a list of battles with most United States military fatalities, in terms of American deaths.

The campaign that resulted in the most US military deaths was the Battle of Normandy (June 6 to August 25, 1944) in which 29,204 soldiers were killed fighting against Nazi Germany.

The bloodiest single day in the history of the United States military is either June 6, 1944, with 2,500 soldiers killed during the Invasion of Normandy on D-Day, or September 12, 1918, at the start of the Battle of Saint Mihiel, with over 2,500 dead (however, this exact figure is unverifiable because of poor documentation).

The deadliest single-day battle in American history, if all engaged armies are considered, is the Battle of Antietam with 3,675 killed, including both United States and Confederate soldiers (total casualties for both sides were 22,717 dead, wounded, or missing Union and Confederate soldiers September 17, 1862).

For example, during the Seven Days Battles during the American Civil War (June 25 to July 1, 1862) there were 5,228 killed, 23,824 wounded and 7,007 missing or taken prisoners for a total of 36,059 casualties.