The Old Barracks Museum, also known just as the Old Barracks, is a historic building located at 101 Barracks Street in Trenton, Mercer County, New Jersey. Built in 1758 to house soldiers of the British Army, it is the only remaining colonial barracks in the state and is one of the only tangible surviving elements of the 1776 Battle of Trenton. The building was added to the National Register of Historic Places on January 25, 1971 and listed as a National Historic Landmark on November 28, 1972, for its significance in military history. It is now a state-run historic site and museum.