404 may refer to:

• 404 (number)
• AD 404
• 404 BC
• HTTP 404, the HTTP error response status for "Not Found"

• Peugeot 404, a large family car
• Bristol 404, a luxury car
• Unimog 404, an offroad-capable truck

• A404(M) motorway, in England
• Ontario Highway 404, in Canada
• Maryland Route 404, in the U.S.
• List of highways numbered 404

• 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
• 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
• "404", a 2018 song by Error

• The 404 (disambiguation)

Topics referred to by the same term

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