404 may refer to: 404 (number) AD 404 404 BC HTTP 404, the HTTP error response status for "Not Found" Cars Peugeot 404 Bristol 404, produced in the 1950s Unimog 404 Highways A404(M) motorway, in England Ontario Highway 404, in Canada Maryland Route 404, in the U.S. List of highways numbered 404 Other uses 404 Error Not Found (film), a 2011 Hindi film 404 (band), a band signed to Dirty Hit Project 404, a United States military mission to Laos during the Vietnam War Alitalia Flight 404, an Alitalia-Linee Aeree Italiane flight that crashed on 14 November 1990 killing all on board Martin 4-0-4, an American pressurized passenger airliner built by the Glenn L. Martin Company Area code 404, a telephone area in Atlanta Section 404 of the 2002 Sarbanes–Oxley Act Room 404 – The Wrong Man, the second room in the 1995 film Four Rooms "404", a song by Ram Jam from the 1977 album Ram Jam See also The 404 (disambiguation)