404 may refer to: 404 (number) AD 404 404 BC HTTP 404, the HTTP error response status for "Not Found"
Cars Peugeot 404, a large family car Bristol 404, a luxury car Unimog 404, an offroad-capable truck
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 Media, online publication focusing on technology and internet reporting Project 404, a United States military mission to Laos during the Vietnam War Pakistan International Airlines Flight 404, a Fokker F27 that disappeared on 25 August 1989 Alitalia Flight 404, a McDonnell Douglas DC-9 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 "404", a 2018 song by Error
See also 404th (disambiguation) The 404 (disambiguation)