104th Regiment

104th Regiment or 104th Infantry Regiment may refer to:


 * 104th Infantry Regiment (United States), a unit of the United States Army from Springfield, Massachusetts - the only United States' military unit ever decorated by a foreign power - receiving France's croix de guerre in World War I and World War II.
 * 104th Regiment Royal Artillery (Volunteers), a unit of the United Kingdom Army
 * 104th Regiment of Foot (Bengal Fusiliers), a unit of the United Kingdom Army
 * The United Kingdom Army unit 104th Regiment of Foot (New Brunswick Regiment)
 * 104th Ohio Infantry, a unit of the United States Army during the American Civil War
 * 104th Training Aviation Regiment, a unit of the Yugoslav Air Force