411 may refer to:

• The year AD 411, the four hundred and eleventh year of the Gregorian calendar
• 411 BC
• 4-1-1, a telephone directory assistance number in the United States and Canada
  • By extension, a slang term for "information"
• What's the 411?, debut album by Mary J. Blige released in 1992
• The 411, British R&B group
• 4:1:1 chroma subsampling
• Volkswagen 411, a car from the late 1960s
• Bristol 411, a high-performance hand-built luxury car from the 1970s
• 411 (anthology), a three issue anthology, published by Marvel Comics, consisting of short-stories concerning terrorism
• 411 is used as a nickname for Kambo, Norway
• .411 is also the extension for files storing thumbnail-sized versions of pictures taken by early models of SONY's Mavica cameras.
• 411 Video Magazine, a skateboarding video series
• November 2016 Jakarta protests, also known as the 411 Action