The 825th Tank Destroyer Battalion was a tank destroyer battalion of the United States Army active during the Second World War. It was organized as a towed battalion, with 3" anti-tank guns, and initially saw service during the Battle of Normandy as a rear-area security unit. Parts of the unit were sent into combat as part of an ad hoc task force on 16 December 1944, on the northern flank of the Ardennes Offensive, where it defended Amblève river bridges at Malmedy and Stavelot. It returned to security duties at the end of January 1945, and served in rear areas for the remainder of the war.