The 473d Infantry Regiment was an infantry regiment of the United States Army that served on the Italian Front during World War II. It was created on 14 January 1945 from existing anti-aircraft units that were no longer needed to defend against enemy aircraft. It was raised from the Headquarters Company, 2d Armored Group and the 434th, 435th, 532d and 900th Antiaircraft Artillery Automatic Weapons battalions. In August 1945 it was deactivated in Italy.