U.S. Route 366 was the designation for two U.S. Highways in the United States, both of which are related to U.S. Route 66: * U.S. Route 366 (1927–1932), a route connecting El Paso and Amarillo, Texas, by way of Clovis, New Mexico * U.S. Route 366 (1932–1939), a route connecting Albuquerque and Willard, New Mexico __DISAMBIG__