The 7th Cavalry Regiment is a United States Army cavalry regiment formed in 1866. Its official nickname is "Garryowen", after the Irish air "Garryowen" that was adopted as its march tune. The regiment participated in some of the largest battles of the Indian Wars, including its famous defeat at the Battle of Little Bighorn, where its commander Lieutenant Colonel George A. Custer was killed.

The 7th Cavalry became part of the 1st Cavalry Division in the 1920s, it went on to fight in the Pacific Theater of World War II and took part in the Admiralty Islands, Leyte and Luzon campaigns. It later participated several key battles of the Korean War. During the Korean War the unit committed the No Gun Ri massacre, in which between 250 and 300 South Korean refugees were killed, mostly women and children. The unit later participated in the Vietnam War. It distinguished itself in the Gulf War and in the Global War on Terror where its squadrons and battalions now serve as Combined Arms Battalions or as reconnaissance squadrons for Brigade Combat Teams in Iraq and Afghanistan.